Update Stylelint to v14, extend SCSS plugins, remove primer-* configs, resolve issues (#821)

This is a catch-all PR that modernizes and updates our Stylelint config, and resolves all open issues. This is a pretty big change - so I want to update all of our related dependencies in lockstep.

In particular, this PR

- [x] updates stylelint to `v14`
- [x] adds in the standard stylelint config for SCSS (`stylelint-config-standard-scss`)
- [x] swaps out `stylelint-config-prettier` for `stylelint-config-prettier-scss`
- [x] ~~properly update `@primer`-related plugins:~~ completely remove `primer` from our configuration
- [x] autofix, manually resolve, or disable all newly-introduced lint errors; **I've avoided manually resolving errors that would be a behavioural change**
- [x] re-runs `npm run format`

See the "next steps" section on some extra thoughts on disabling errors.

(implicitly, I'm also using node 16/the new package-lock format).

### disabling rules and next steps

I've introduced several new disabled rules. Let me quickly explain what's going on; there are two categories of rules I've disabled:

1. rules that were temporary disables; they were frequent enough that I couldn't manually resolve them, but should be simple. **I plan on opening issues to re-enable each of these rules**, just after this PR
    - `declaration-block-no-redundant-longhand-properties`: this is just tedious and error-prone
    - `no-descending-specificity`: this one is tricky since it could have impacts on the cascade (though that seems unlikely)
    - `scss/no-global-function-names`: I think we need to [import map and then use `map.get`](https://stackoverflow.com/questions/64210390/sass-map-get-doesnt-work-map-get-does-what-gives), but I'll leave this as out of scope for now
2. rules that are long-term disables; due to the SASS-based nature of our theme, I think we'll keep these in limbo
    - `alpha-value-notation` causes problems with SASS using the `modern` syntax - literals like `50%` are not properly interpolated, and they cause formatting issues on the site
    - `color-function-notation` also causes problems with SASS, but in this case the `modern` syntax breaks SASS compilation; we're not alone (see this [SO post](https://stackoverflow.com/questions/71805735/error-function-rgb-is-missing-argument-green-in-sass)). 

In addition, we have many inline `stylelint-disable` comments. I'd open a separate issue to audit them, especially since I think some disables are unnecessary.

### on Primer 

**note: there hasn't been much other discussion, so I'm going to remove primer's stylelint config.**

If I do add `@primer/stylelint-config`, I get *a ton* of errors about now using `@primer`'s in-built SCSS variables. I imagine that we probably won't want to use these presets (though I could be wrong). In that case, I think we could either:

1. disable all of those rules
4. not use `@primer/stylelint-config`, since we're not actually using primer, and shift back to the standard SCSS config provided by Stylelint

~~Any thoughts here? I also don't have the original context as to why we do use the primer rules, perhaps @pmarsceill can chime in?~~

_sass/utilities/_colors.scss

@@ -1,6 +1,4 @@
-//
 // Utility classes for colors
-//
 
 // Text colors
 

_sass/utilities/_layout.scss

@@ -1,22 +1,23 @@
-// stylelint-disable primer/selector-no-utility, primer/no-override
-//
 // Utility classes for layout
-//
 
 // Display
 
 .d-block {
   display: block !important;
 }
+
 .d-flex {
   display: flex !important;
 }
+
 .d-inline {
   display: inline !important;
 }
+
 .d-inline-block {
   display: inline-block !important;
 }
+
 .d-none {
   display: none !important;
 }
@@ -78,18 +79,23 @@
 .v-align-baseline {
   vertical-align: baseline !important;
 }
+
 .v-align-bottom {
   vertical-align: bottom !important;
 }
+
 .v-align-middle {
   vertical-align: middle !important;
 }
+
 .v-align-text-bottom {
   vertical-align: text-bottom !important;
 }
+
 .v-align-text-top {
   vertical-align: text-top !important;
 }
+
 .v-align-top {
   vertical-align: top !important;
 }

_sass/utilities/_lists.scss

@@ -1,8 +1,6 @@
-//
 // Utility classes for lists
-//
 
-// stylelint-disable primer/selector-no-utility, primer/no-override, selector-max-type
+// stylelint-disable selector-max-type
 
 .list-style-none {
   padding: 0 !important;

_sass/utilities/_spacing.scss

@@ -1,9 +1,6 @@
-//
 // Utility classes for margins and padding
-//
 
-// scss-lint:disable SpaceAfterPropertyName
-// stylelint-disable block-opening-brace-space-after, block-opening-brace-space-before, primer/selector-no-utility, primer/no-override
+// stylelint-disable block-opening-brace-space-after, block-opening-brace-space-before
 
 // Margin spacer utilities
 

_sass/utilities/_typography.scss

@@ -1,8 +1,4 @@
-//
 // Utility classes for typography
-//
-
-// stylelint-disable primer/selector-no-utility, primer/no-override
 
 .fs-1 {
   @include fs-1;
@@ -87,5 +83,3 @@
 .text-uppercase {
   text-transform: uppercase !important;
 }
-
-// stylelint-enable primer/selector-no-utility