diff --git a/.gitignore b/.gitignore
index b447a12..a802a86 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 *.gem
 .bundle
+.jekyll-cache
 .sass-cache
 _site
 Gemfile.lock
diff --git a/.prettierignore b/.prettierignore
index 41fbef8..5dc073f 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1,8 +1,9 @@
 package.json
 package-lock.json
 _site
-assets/css/dark-mode-preview.scss
-assets/css/just-the-docs.scss
+assets/css/just-the-docs-default.scss
+assets/css/just-the-docs-light.scss
+assets/css/just-the-docs-dark.scss
 assets/js/vendor/lunr.min.js
 assets/js/search-data.json
 assets/js/just-the-docs.js
diff --git a/.stylelintrc.json b/.stylelintrc.json
index a14d920..329ca34 100644
--- a/.stylelintrc.json
+++ b/.stylelintrc.json
@@ -1,7 +1,8 @@
 {
   "ignoreFiles": [
-    "assets/css/just-the-docs.scss",
-    "assets/css/dark-mode-preview.scss",
+    "assets/css/just-the-docs-default.scss",
+    "assets/css/just-the-docs-light.scss",
+    "assets/css/just-the-docs-dark.scss",
     "_sass/vendor/**/*.scss"
   ],
   "extends": ["stylelint-config-primer", "stylelint-config-prettier"],
diff --git a/_config.yml b/_config.yml
index a090670..2ef1604 100644
--- a/_config.yml
+++ b/_config.yml
@@ -38,15 +38,32 @@ aux_links:
   "Just the Docs on GitHub":
     - "//github.com/pmarsceill/just-the-docs"
 
-# Footer content appears at the bottom of every page's main content
-footer_content: "Copyright &copy; 2017-2019 Patrick Marsceill. Distributed by an <a href=\"https://github.com/pmarsceill/just-the-docs/tree/master/LICENSE.txt\">MIT license.</a>"
+# Sort order for navigation links
+nav_sort: case_insensitive # default, equivalent to nil
+# nav_sort: case_sensitive # Capital letters sorted before lowercase
 
-# Color scheme currently only supports "dark" or nil (default)
+# Footer content
+# appears at the bottom of every page's main content
+footer_content: "Copyright &copy; 2017-2020 Patrick Marsceill. Distributed by an <a href=\"https://github.com/pmarsceill/just-the-docs/tree/master/LICENSE.txt\">MIT license.</a>"
+
+# Footer last edited timestamp
+last_edit_timestamp: true # show or hide edit time - page must have `last_modified_date` defined in the frontmatter
+last_edit_time_format: "%b %e %Y at %I:%M %p" # uses ruby's time format: https://ruby-doc.org/stdlib-2.7.0/libdoc/time/rdoc/Time.html
+
+# Footer "Edit this page on GitHub" link text
+gh_edit_link: true # show or hide edit this page link
+gh_edit_link_text: "Edit this page on GitHub"
+gh_edit_repository: "https://github.com/pmarsceill/just-the-docs" # the github URL for your repo
+gh_edit_branch: "master" # the branch that your docs is served from
+gh_edit_view_mode: "tree" # "tree" or "edit" if you want the user to jump into the editor immediately
+
+# Color scheme currently only supports "dark", "light"/nil (default), or a custom scheme that you define
 color_scheme: nil
 
 # Google Analytics Tracking (optional)
 # e.g, UA-1234567-89
 ga_tracking: UA-2709176-10
+ga_tracking_anonymize_ip: true # Use GDPR compliant Google Analytics settings (true/nil by default)
 
 plugins:
   - jekyll-seo-tag
diff --git a/_includes/css/custom.scss.liquid b/_includes/css/custom.scss.liquid
new file mode 100644
index 0000000..2ad1576
--- /dev/null
+++ b/_includes/css/custom.scss.liquid
@@ -0,0 +1 @@
+@import "./custom/custom";
diff --git a/_includes/css/just-the-docs.scss.liquid b/_includes/css/just-the-docs.scss.liquid
new file mode 100644
index 0000000..495cd6d
--- /dev/null
+++ b/_includes/css/just-the-docs.scss.liquid
@@ -0,0 +1,7 @@
+{% if site.logo %}
+$logo: "{{ site.logo | absolute_url }}";
+{% endif %}
+@import "./support/support";
+@import "./color_schemes/{{ include.color_scheme }}";
+@import "./modules";
+{% include css/custom.scss.liquid %}
diff --git a/_includes/head.html b/_includes/head.html
index eae6a5e..4f22497 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -2,17 +2,17 @@
   <meta charset="UTF-8">
   <meta http-equiv="X-UA-Compatible" content="IE=Edge">
 
-  {% if site.plugins.jekyll-seo == nil %}
+  {% unless site.plugins contains "jekyll-seo-tag" %}
     <title>{{ page.title }} - {{ site.title }}</title>
 
     {% if page.description %}
       <meta name="Description" content="{{ page.description }}">
     {% endif %}
-  {% endif %}
+  {% endunless %}
 
   <link rel="shortcut icon" href="{{ 'favicon.ico' | absolute_url }}" type="image/x-icon">
 
-  <link rel="stylesheet" href="{{ '/assets/css/just-the-docs.css' | absolute_url }}">
+  <link rel="stylesheet" href="{{ '/assets/css/just-the-docs-default.css' | absolute_url }}">
 
   {% if site.ga_tracking != nil %}
     <script async src="https://www.googletagmanager.com/gtag/js?id={{ site.ga_tracking }}"></script>
@@ -21,7 +21,7 @@
       function gtag(){dataLayer.push(arguments);}
       gtag('js', new Date());
 
-      gtag('config', "{{ site.ga_tracking }}");
+      gtag('config', '{{ site.ga_tracking }}'{% unless site.ga_tracking_anonymize_ip == nil %}, { 'anonymize_ip': true }{% endunless %});
     </script>
 
   {% endif %}
diff --git a/_includes/nav.html b/_includes/nav.html
index dafacc8..7ce7259 100644
--- a/_includes/nav.html
+++ b/_includes/nav.html
@@ -1,6 +1,15 @@
 <nav role="navigation" aria-label="Main navigation">
   <ul class="navigation-list">
-    {%- assign pages_list = site.html_pages | sort:"nav_order" -%}
+    {%- assign ordered_pages_list = site.html_pages | where_exp:"item", "item.nav_order != nil" -%}
+    {%- assign unordered_pages_list = site.html_pages | where_exp:"item", "item.nav_order == nil" -%}
+    {%- if site.nav_sort == 'case_sensitive' -%}
+      {%- assign sorted_ordered_pages_list = ordered_pages_list | sort:"nav_order" -%}
+      {%- assign sorted_unordered_pages_list = unordered_pages_list | sort:"title" -%}
+    {%- else -%}
+      {%- assign sorted_ordered_pages_list = ordered_pages_list | sort_natural:"nav_order" -%}
+      {%- assign sorted_unordered_pages_list = unordered_pages_list | sort_natural:"title" -%}
+    {%- endif -%}
+    {%- assign pages_list = sorted_ordered_pages_list | concat: sorted_unordered_pages_list -%}
     {%- for node in pages_list -%}
       {%- unless node.nav_exclude -%}
         {%- if node.parent == nil -%}
@@ -10,16 +19,17 @@
             {%- endif -%}
             <a href="{{ node.url | absolute_url }}" class="navigation-list-link{% if page.url == node.url %} active{% endif %}">{{ node.title }}</a>
             {%- if node.has_children -%}
-              {%- assign children_list = site.html_pages | where: "parent", node.title | sort:"nav_order" -%}
+              {%- assign children_list = pages_list | where: "parent", node.title -%}
               <ul class="navigation-list-child-list ">
                 {%- for child in children_list -%}
+                {%- unless child.nav_exclude -%}
                   <li class="navigation-list-item {% if page.url == child.url or page.parent == child.title %} active{% endif %}">
                     {%- if page.url == child.url or page.parent == child.title -%}
                       {%- assign second_level_url = child.url | absolute_url -%}
                     {%- endif -%}
                     <a href="{{ child.url | absolute_url }}" class="navigation-list-link{% if page.url == child.url %} active{% endif %}">{{ child.title }}</a>
                     {%- if child.has_children -%}
-                        {%- assign grand_children_list = site.html_pages | where: "parent", child.title | where: "grand_parent", node.title | sort:"nav_order" -%}
+                        {%- assign grand_children_list = site.html_pages | where: "parent", child.title | where: "grand_parent", node.title -%}
                         <ul class="navigation-list-child-list">
                         {%- for grand_child in grand_children_list -%}
                           <li class="navigation-list-item {% if page.url == grand_child.url %} active{% endif %}">
@@ -29,6 +39,7 @@
                       </ul>
                     {%- endif -%}
                   </li>
+                {%- endunless -%}
                 {%- endfor -%}
               </ul>
             {%- endif -%}
diff --git a/_layouts/default.html b/_layouts/default.html
index e198b4b..2dae34b 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -74,7 +74,6 @@ layout: table_wrappers
           {% if page.has_children == true and page.has_toc != false %}
             <hr>
             <h2 class="text-delta">Table of contents</h2>
-            {% assign children_list = site.pages | sort:"nav_order" %}
             <ul>
               {% for child in children_list %}
                 {% if child.parent == page.title and child.title != page.title and child.grand_parent == page.parent %}
@@ -86,10 +85,29 @@ layout: table_wrappers
             </ul>
           {% endif %}
 
-          {% if site.footer_content != nil %}
+          {% if site.footer_content != nil or site.last_edit_timestamp or site.gh_edit_link %}
             <hr>
             <footer role="contentinfo">
+              {% if site.last_edit_timestamp and site.last_edit_time_format and page.last_modified_date %}
+              <p class="text-small text-grey-dk-000 mb-0">
+                Page last modified: {{ page.last_modified_date | date: site.last_edit_time_format }}.
+              </p>
+              {% endif %}
+              {% 
+                if 
+                  site.gh_edit_link and 
+                  site.gh_edit_link_text and 
+                  site.gh_edit_repository and 
+                  site.gh_edit_view_mode and 
+                  site.gh_edit_branch
+              %}
+              <p class="text-small text-grey-dk-000 mb-0">
+                <a href="{{ site.gh_edit_repository }}/{{ site.gh_edit_view_mode }}/{{ site.gh_edit_branch }}/{{ page.path }}">{{ site.edit_link_text }}</a>
+              </p>
+              {% endif %}
+              {% if site.footer_content != nil %}
               <p class="text-small text-grey-dk-000 mb-0">{{ site.footer_content }}</p>
+              {% endif %}
             </footer>
           {% endif %}
 
diff --git a/_layouts/table_wrappers.html b/_layouts/table_wrappers.html
index cc6187a..3f8f226 100644
--- a/_layouts/table_wrappers.html
+++ b/_layouts/table_wrappers.html
@@ -4,4 +4,4 @@ layout: vendor/compress
 
 {% assign content_ = content | replace: '<table', '<div class="table-wrapper"><table' %}
 {% assign content_ = content_ | replace: '</table>', '</table></div>' %}
-{{ content_ }}
\ No newline at end of file
+{{ content_ }}
diff --git a/_sass/color_schemes/light.scss b/_sass/color_schemes/light.scss
new file mode 100644
index 0000000..e69de29
diff --git a/_sass/custom/custom.scss b/_sass/custom/custom.scss
index 9ac503b..e69de29 100644
--- a/_sass/custom/custom.scss
+++ b/_sass/custom/custom.scss
@@ -1,129 +0,0 @@
-////
-//// Typography
-////
-
-//$body-font-family: -apple-system, BlinkMacSystemFont, "helvetica neue", helvetica, roboto, noto, "segoe ui", arial, sans-serif;
-//$mono-font-family: "SFMono-Regular", Menlo, Consolas, Monospace;
-//$root-font-size: 16px;         // Base font-size for rems
-//$body-line-height: 1.4;
-//$content-line-height: 1.5;
-//$body-heading-line-height: 1.15;
-
-////
-//// Colors
-////
-
-//$white: #fff;
-
-//$grey-dk-000: #959396;
-//$grey-dk-100: #5c5962;
-//$grey-dk-200: #44434d;
-//$grey-dk-250: #302d36;
-//$grey-dk-300: #27262b;
-
-//$grey-lt-000: #f5f6fa;
-//$grey-lt-100: #eeebee;
-//$grey-lt-200: #ecebed;
-//$grey-lt-300: #e6e1e8;
-
-//$purple-000: #7253ed;
-//$purple-100: #5e41d0;
-//$purple-200: #4e26af;
-//$purple-300: #381885;
-
-//$blue-000: #2c84fa;
-//$blue-100: #2869e6;
-//$blue-200: #264caf;
-//$blue-300: #183385;
-
-//$green-000: #41d693;
-//$green-100: #11b584;
-//$green-200: #009c7b;
-//$green-300: #026e57;
-
-//$yellow-000: #ffeb82;
-//$yellow-100: #fadf50;
-//$yellow-200: #f7d12e;
-//$yellow-300: #e7af06;
-
-//$red-000: #f77e7e;
-//$red-100: #f96e65;
-//$red-200: #e94c4c;
-//$red-300: #dd2e2e;
-
-//$body-background-color: $white;
-//$sidebar-color: $grey-lt-000;
-//$search-background-color: $white;
-//$table-background-color: $white;
-//$code-background-color: $grey-lt-000;
-
-//$body-text-color: $grey-dk-100;
-//$body-heading-color: $grey-dk-300;
-//$search-result-preview-color: $grey-dk-000;
-//$nav-child-link-color: $grey-dk-100;
-//$link-color: $purple-000;
-//$btn-primary-color: $purple-100;
-//$base-button-color: #f7f7f7;
-
-////
-//// Spacing
-////
-
-//$spacing-unit: 1rem; // 1rem == 16px
-
-//$spacers: (
-//sp-0: 0,
-//sp-1: $spacing-unit * 0.25,
-//sp-2: $spacing-unit * 0.5,
-//sp-3: $spacing-unit * 0.75,
-//sp-4: $spacing-unit,
-//sp-5: $spacing-unit * 1.5,
-//sp-6: $spacing-unit * 2,
-//sp-7: $spacing-unit * 2.5,
-//sp-8: $spacing-unit * 3,
-//sp-9: $spacing-unit * 3.5,
-//sp-10: $spacing-unit * 4
-//);
-
-//$sp-1: map-get($spacers, sp-1); // 0.25 rem == 4px
-//$sp-2: map-get($spacers, sp-2); // 0.5  rem == 8px
-//$sp-3: map-get($spacers, sp-3); // 0.75 rem == 12px
-//$sp-4: map-get($spacers, sp-4); // 1    rem == 16px
-//$sp-5: map-get($spacers, sp-5); // 1.5  rem == 24px
-//$sp-6: map-get($spacers, sp-6); // 2    rem == 32px
-//$sp-7: map-get($spacers, sp-7); // 2.5  rem == 40px
-//$sp-8: map-get($spacers, sp-8); // 3    rem == 48px
-//$sp-9: map-get($spacers, sp-9); // 4    rem == 48px
-//$sp-10: map-get($spacers, sp-10); // 4.5  rem == 48px
-
-////
-//// Borders
-////
-
-//$border: 1px solid;
-//$border-radius: 4px;
-//$border-color: $grey-lt-100;
-
-////
-//// Grid system
-////
-
-//$gutter-spacing: $sp-6;
-//$gutter-spacing-sm: $sp-4;
-//$nav-width: 264px;
-//$nav-width-md: 248px;
-//$content-width: 800px;
-//$header-height: 60px;
-//$search-results-width: 500px;
-
-////
-//// Media queries in pixels
-////
-
-//$media-queries: (
-//xs: 320px,
-//sm: 500px,
-//md: $content-width,
-//lg: $content-width + $nav-width,
-//xl: 1400px
-//);
diff --git a/_sass/modules.scss b/_sass/modules.scss
new file mode 100644
index 0000000..dc94a4b
--- /dev/null
+++ b/_sass/modules.scss
@@ -0,0 +1,19 @@
+//
+// Import external dependencies
+//
+@import "./vendor/normalize.scss/normalize.scss";
+
+//
+// Modules
+//
+@import "./base";
+@import "./layout";
+@import "./content";
+@import "./navigation";
+@import "./typography";
+@import "./labels";
+@import "./buttons";
+@import "./search";
+@import "./tables";
+@import "./code";
+@import "./utilities/utilities";
diff --git a/_sass/overrides.scss b/_sass/overrides.scss
deleted file mode 100644
index 21e9527..0000000
--- a/_sass/overrides.scss
+++ /dev/null
@@ -1,3 +0,0 @@
-//
-// Custom overrides from a user.
-//
diff --git a/assets/css/dark-mode-preview.scss b/assets/css/dark-mode-preview.scss
deleted file mode 100644
index c524e81..0000000
--- a/assets/css/dark-mode-preview.scss
+++ /dev/null
@@ -1,45 +0,0 @@
----
-# this ensures Jekyll reads the file to be transformed into CSS later
-# only Main files contain this front matter, not partials.
----
-
-{% if site.logo %}
-$logo: "{{ site.logo | absolute_url }}";
-{% endif %}
-
-//
-// Import external dependencies
-//
-
-@import "./vendor/normalize.scss/normalize.scss";
-
-//
-// Import Just the Docs scss
-//
-
-// Support
-@import "./support/support";
-
-//
-// Import custom color scheme scss
-//
-
-@import "./color_schemes/dark.scss";
-
-// Modules
-@import "./base";
-@import "./layout";
-@import "./content";
-@import "./navigation";
-@import "./typography";
-@import "./labels";
-@import "./buttons";
-@import "./search";
-@import "./tables";
-@import "./code";
-@import "./utilities/utilities";
-
-//
-// Import custom overrides
-//
-@import "./custom/custom";
diff --git a/assets/css/just-the-docs-dark.scss b/assets/css/just-the-docs-dark.scss
new file mode 100644
index 0000000..ac92fb1
--- /dev/null
+++ b/assets/css/just-the-docs-dark.scss
@@ -0,0 +1,3 @@
+---
+---
+{% include css/just-the-docs.scss.liquid color_scheme="dark" %}
diff --git a/assets/css/just-the-docs-default.scss b/assets/css/just-the-docs-default.scss
new file mode 100644
index 0000000..63fde26
--- /dev/null
+++ b/assets/css/just-the-docs-default.scss
@@ -0,0 +1,8 @@
+---
+---
+{% if site.color_scheme and site.color_scheme != "nil" %}
+  {% assign color_scheme = site.color_scheme %}
+{% else %}
+  {% assign color_scheme = "light" %}
+{% endif %}
+{% include css/just-the-docs.scss.liquid color_scheme=color_scheme %}
diff --git a/assets/css/just-the-docs-light.scss b/assets/css/just-the-docs-light.scss
new file mode 100644
index 0000000..ac69688
--- /dev/null
+++ b/assets/css/just-the-docs-light.scss
@@ -0,0 +1,3 @@
+---
+---
+{% include css/just-the-docs.scss.liquid color_scheme="light" %}
diff --git a/assets/css/just-the-docs.scss b/assets/css/just-the-docs.scss
deleted file mode 100644
index 199ad89..0000000
--- a/assets/css/just-the-docs.scss
+++ /dev/null
@@ -1,49 +0,0 @@
----
-# this ensures Jekyll reads the file to be transformed into CSS later
-# only Main files contain this front matter, not partials.
----
-
-{% if site.logo %}
-$logo: "{{ site.logo | absolute_url }}";
-{% endif %}
-
-//
-// Import external dependencies
-//
-
-@import "./vendor/normalize.scss/normalize.scss";
-
-//
-// Import Just the Docs scss
-//
-
-// Support
-@import "./support/support";
-
-//
-// Import custom overrides
-//
-
-@import "./custom/custom";
-
-//
-// Import custom color scheme scss
-//
-
-{% if site.color_scheme == "dark" %}
-@import "./color_schemes/dark.scss";
-{% endif %}
-
-// Modules
-@import "./base";
-@import "./layout";
-@import "./content";
-@import "./navigation";
-@import "./typography";
-@import "./labels";
-@import "./buttons";
-@import "./search";
-@import "./tables";
-@import "./code";
-@import "./utilities/utilities";
-@import "./overrides";
diff --git a/assets/js/dark-mode-preview.js b/assets/js/dark-mode-preview.js
deleted file mode 100644
index bb3169f..0000000
--- a/assets/js/dark-mode-preview.js
+++ /dev/null
@@ -1,25 +0,0 @@
-document.addEventListener("DOMContentLoaded", function () {
-  const toggleDarkMode = document.querySelector(".js-toggle-dark-mode")
-  const cssFile = document.querySelector('[rel="stylesheet"]')
-  const originalCssRef = cssFile.getAttribute("href")
-  const darkModeCssRef = originalCssRef.replace(
-    "just-the-docs.css",
-    "dark-mode-preview.css"
-  )
-  const buttonCopy = ["Return to the light side", "Preview dark color scheme"]
-  const updateButtonText = function (toggleDarkMode) {
-    toggleDarkMode.textContent === buttonCopy[0]
-      ? (toggleDarkMode.textContent = buttonCopy[1])
-      : (toggleDarkMode.textContent = buttonCopy[0])
-  }
-
-  jtd.addEvent(toggleDarkMode, "click", function () {
-    if (cssFile.getAttribute("href") === originalCssRef) {
-      cssFile.setAttribute("href", darkModeCssRef)
-      updateButtonText(toggleDarkMode)
-    } else {
-      cssFile.setAttribute("href", originalCssRef)
-      updateButtonText(toggleDarkMode)
-    }
-  })
-})
diff --git a/assets/js/just-the-docs.js b/assets/js/just-the-docs.js
index 2f6cea0..2edf7f4 100644
--- a/assets/js/just-the-docs.js
+++ b/assets/js/just-the-docs.js
@@ -279,11 +279,25 @@ function initSearch() {
   }
 }
 
+// Focus
+
 function pageFocus() {
   var mainContent = document.querySelector('.js-main-content');
   mainContent.focus();
 }
 
+// Switch theme
+
+jtd.getTheme = function() {
+  var cssFileHref = document.querySelector('[rel="stylesheet"]').getAttribute('href');
+  return cssFileHref.substring(cssFileHref.lastIndexOf('-') + 1, cssFileHref.length - 4);
+}
+
+jtd.setTheme = function(theme) {
+  var cssFile = document.querySelector('[rel="stylesheet"]');
+  cssFile.setAttribute('href', '{{ "assets/css/just-the-docs-" | absolute_url }}' + theme + '.css');
+}
+
 // Document ready
 
 jtd.onReady(function(){
diff --git a/docs/configuration.md b/docs/configuration.md
index eb43a08..f3a7a02 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -38,7 +38,6 @@ search_enabled: true
 
 # Enable support for hyphenated search words:
 search_tokenizer_separator: /[\s/]+/
-
 ```
 
 ## Aux links
@@ -56,26 +55,56 @@ aux_links:
 # Heading anchor links appear on hover over h1-h6 tags in page content
 # allowing users to deep link to a particular heading on a page.
 #
-# Supports true (default) or false/nil
+# Supports true (default) or false
 heading_anchors: true
 ```
 
 ## Footer content
 
 ```yaml
-# Footer content appears at the bottom of every page's main content
+# Footer content 
+# appears at the bottom of every page's main content
 footer_content: "Copyright &copy; 2017-2019 Patrick Marsceill. Distributed by an <a href=\"https://github.com/pmarsceill/just-the-docs/tree/master/LICENSE.txt\">MIT license.</a>"
+
+# Footer last edited timestamp
+last_edit_timestamp: true # show or hide edit time - page must have `last_modified_date` defined in the frontmatter
+last_edit_time_format: "%b %e %Y at %I:%M %p" # uses ruby's time format: https://ruby-doc.org/stdlib-2.7.0/libdoc/time/rdoc/Time.html
+
+# Footer "Edit this page on GitHub" link text
+gh_edit_link: true # show or hide edit this page link
+gh_edit_link_text: "Edit this page on GitHub."
+gh_edit_repository: "https://github.com/pmarsceill/just-the-docs" # the github URL for your repo
+gh_edit_branch: "master" # the branch that your docs is served from
+gh_edit_view_mode: "tree" # "tree" or "edit" if you want the user to jump into the editor immediately
 ```
 
+- the "page last modified" data will only display if a page has a key called `last_modified_date`, formatted in some readable date format
+- `last_edit_time_format` uses Ruby's DateTime formatter; see examples and more information [at this link.](https://apidock.com/ruby/DateTime/strftime)
+- `gh_edit_repository` is the URL of the project's GitHub repository
+- `gh_edit_branch` is the branch that the docs site is served from; defaults to `master`
+- `gh_edit_view_mode` is `"tree"` by default, which brings the user to the github page; switch to `"edit"` to bring the user directly into editing mode
+
 ## Color scheme
 
 ```yaml
-# Color scheme currently only supports "dark" or nil (default)
-color_scheme: "dark"
+# Color scheme supports "light" (default) and "dark"
+color_scheme: dark
 ```
 <button class="btn js-toggle-dark-mode">Preview dark color scheme</button>
 
-<script type="text/javascript" src="{{ "/assets/js/dark-mode-preview.js" | absolute_url }}"></script>
+<script>
+const toggleDarkMode = document.querySelector('.js-toggle-dark-mode');
+
+jtd.addEvent(toggleDarkMode, 'click', function(){
+  if (jtd.getTheme() === 'dark') {
+    jtd.setTheme('light');
+    toggleDarkMode.textContent = 'Preview dark color scheme';
+  } else {
+    jtd.setTheme('dark');
+    toggleDarkMode.textContent = 'Return to the light side';
+  }
+});
+</script>
 
 See [Customization]({{ site.baseurl }}{% link docs/customization.md %}) for more information.
 
@@ -85,4 +114,5 @@ See [Customization]({{ site.baseurl }}{% link docs/customization.md %}) for more
 # Google Analytics Tracking (optional)
 # e.g, UA-1234567-89
 ga_tracking: UA-5555555-55
+ga_tracking_anonymize_ip: true # Use GDPR compliant Google Analytics settings (true by default)
 ```
diff --git a/docs/customization.md b/docs/customization.md
index 883c94c..cbcd38c 100644
--- a/docs/customization.md
+++ b/docs/customization.md
@@ -29,37 +29,77 @@ To enable a color scheme, set the `color_scheme` parameter in your site's `_conf
 {: .no_toc }
 
 ```yaml
-# Color scheme currently only supports "dark" or nil (default)
-color_scheme: "dark"
+# Color scheme supports "light" (default) and "dark"
+color_scheme: dark
 ```
 <button class="btn js-toggle-dark-mode">Preview dark color scheme</button>
 
-<script type="text/javascript" src="{{ "/assets/js/dark-mode-preview.js" | absolute_url }}"></script>
+<script>
+const toggleDarkMode = document.querySelector('.js-toggle-dark-mode');
 
-## Specific visual customization
+jtd.addEvent(toggleDarkMode, 'click', function(){
+  if (jtd.getTheme() === 'dark') {
+    jtd.setTheme('light');
+    toggleDarkMode.textContent = 'Preview dark color scheme';
+  } else {
+    jtd.setTheme('dark');
+    toggleDarkMode.textContent = 'Return to the light side';
+  }
+});
+</script>
 
-To customize your site’s aesthetic, open `_sass/custom/custom.scss` in your editor to see if there is a variable that you can override. Most styles like fonts, colors, spacing, etc. are derived from these variables. To override a specific variable, uncomment its line and change its value.
+## Custom schemes
 
-For example, to change the link color from the purple default to blue, open `_sass/custom/custom.css` and find the `$link-color` variable on line `50`. Uncomment it, and change its value to our `$blue-000` variable, or another shade of your choosing.
+### Define a custom scheme
+
+You can add custom schemes.
+If you want to add a scheme named `foo` (can be any name) just add a file `_sass/color_schemes/foo.scss` (replace `foo` by your scheme name) 
+where you override theme variables to change colors, fonts, spacing, etc.
+
+Available variables are listed in the [_variables.scss](https://github.com/pmarsceill/just-the-docs/tree/master/_sass/support/_variables.scss) file.
+
+For example, to change the link color from the purple default to blue, include the following inside your scheme file:
 
 #### Example
 {: .no_toc }
 
 ```scss
-// ...
-//
-// $body-text-color: $grey-dk-100;
-// $body-heading-color: $grey-dk-300;
 $link-color: $blue-000;
-//
-// ...
 ```
 
 _Note:_ Editing the variables directly in `_sass/support/variables.scss` is not recommended and can cause other dependencies to fail.
+Please use scheme files.
 
-## Override styles
+### Use a custom scheme
 
-For styles that aren't defined as a variables, you may want to modify specific CSS classes. To add your own CSS overrides at the end of the cascade, edit `_sass/overrides.scss`. This will allow for all overrides to be kept in a single file, and for any upstream changes to still be applied.
+To use the custom color scheme, only set the `color_scheme` parameter in your site's `_config.yml` file:
+```yaml
+color_scheme: foo
+```
+
+### Switchable custom scheme
+
+If you want to be able to change the scheme dynamically, for example via javascript, just add a file `assets/css/just-the-docs-foo.scss` (replace `foo` by your scheme name)
+with the following content:`
+
+{% raw %}
+    ---
+    ---
+    {% include css/just-the-docs.scss.liquid color_scheme="foo" %}
+{% endraw %}
+
+This allows you to switch the scheme via the following javascript.
+
+```js
+jtd.setTheme('foo');
+```
+
+## Override and completely custom styles
+
+For styles that aren't defined as variables, you may want to modify specific CSS classes.
+Additionally, you may want to add completely custom CSS specific to your content.
+To do this, put your styles in the file `_sass/custom/custom.scss`.
+This will allow for all overrides to be kept in a single file, and for any upstream changes to still be applied.
 
 For example, if you'd like to add your own styles for printing a page, you could add the following styles.
 
diff --git a/docs/navigation-structure.md b/docs/navigation-structure.md
index a4fef75..e5f29ad 100644
--- a/docs/navigation-structure.md
+++ b/docs/navigation-structure.md
@@ -38,6 +38,12 @@ nav_order: 4
 ---
 ```
 
+The specified `nav_order` parameters on a site should be all integers or all strings.
+Pages without a `nav_order` parameter are ordered alphabetically by their `title`,
+and appear after the explicitly-ordered pages at each level.
+To sort all Capital letters before lowercase letters,
+add `nav_sort: case_sensitive` in the configuration file.
+
 ---
 
 ## Excluding pages
diff --git a/docs/utilities/color.md b/docs/utilities/color.md
index ba90b3b..0f37597 100644
--- a/docs/utilities/color.md
+++ b/docs/utilities/color.md
@@ -2,7 +2,6 @@
 layout: default
 title: Color
 parent: Utilities
-nav_order: 3
 ---
 
 # Color Utilities
diff --git a/docs/utilities/layout.md b/docs/utilities/layout.md
index 38ec1b2..4410459 100644
--- a/docs/utilities/layout.md
+++ b/docs/utilities/layout.md
@@ -2,7 +2,6 @@
 layout: default
 title: Layout
 parent: Utilities
-nav_order: 2
 ---
 
 # Layout Utilities
diff --git a/docs/utilities/responsive-modifiers.md b/docs/utilities/responsive-modifiers.md
index bc5e2cb..c732530 100644
--- a/docs/utilities/responsive-modifiers.md
+++ b/docs/utilities/responsive-modifiers.md
@@ -2,7 +2,6 @@
 layout: default
 title: Responsive Modifiers
 parent: Utilities
-nav_order: 1
 ---
 
 # Responsive modifiers
diff --git a/docs/utilities/typography.md b/docs/utilities/typography.md
index 786b65a..6b952a9 100644
--- a/docs/utilities/typography.md
+++ b/docs/utilities/typography.md
@@ -2,7 +2,6 @@
 layout: default
 title: Typography
 parent: Utilities
-nav_order: 4
 ---
 
 # Typography Utilities
diff --git a/just-the-docs.gemspec b/just-the-docs.gemspec
index a426d4e..239b479 100644
--- a/just-the-docs.gemspec
+++ b/just-the-docs.gemspec
@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |spec|
   spec.name          = "just-the-docs"
-  spec.version       = "0.2.8"
+  spec.version       = "0.2.9"
   spec.authors       = ["Patrick Marsceill"]
   spec.email         = ["patrick.marsceill@gmail.com"]
 
@@ -13,7 +13,7 @@ Gem::Specification.new do |spec|
   spec.files         = `git ls-files -z`.split("\x0").select { |f| f.match(%r{^(assets|bin|_layouts|_includes|lib|Rakefile|_sass|LICENSE|README)}i) }
   spec.executables   << 'just-the-docs'
   
-  spec.add_runtime_dependency "bundler", "~> 2.1.4"
+  spec.add_development_dependency "bundler", "~> 2.1.4"
   spec.add_runtime_dependency "jekyll", ">= 3.8.5", "< 4.1.0"
   spec.add_runtime_dependency "jekyll-seo-tag", "~> 2.0"
   spec.add_runtime_dependency "rake", ">= 12.3.1", "< 13.1.0"
diff --git a/package-lock.json b/package-lock.json
index 91ae4af..c878f4f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "just-the-docs",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index a9fd8e1..c2ab5ff 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "just-the-docs",
-  "version": "0.2.8",
+  "version": "0.2.9",
   "description": "A modern Jekyll theme for documentation",
   "repository": "pmarsceill/just-the-docs",
   "license": "MIT",