* Simplify Header rendering, remove the use of react-slot-fill
* Remove the useless "/analytics" route
* Move all the <Header> renders to the new, declarative way of specifying breadcrumbs
* Re-render the Layout when a report is added using the REPORTS_FILTER, since that affects the breadcrumbs output
* Fix the base breadcrumb link and breadcrumbs on embedded pages
* Expanded Layout.propTypes to specify the breadcrumbs' shape
* Remove content from README, leaving only the example
* Rename edited READMEs
* Add a devdocs page rendering from markdown example files
* Add more components to devdocs
* Add the rest of the component examples
* Add navigation to single components, show generated readme on single component view
* Style devdocs like calypso
* Split devdocs into two columns at “desktop” sizes
* Update segmented selection example
* Update link
* Add header to avoid notices error