* fix(breadcrumbs): problem with folder whitespace
use slugs for folder hrefs so folder paths get resolved properly
* feat: only use `slug` for constructing crumbs
* fix: remove capitalization
* fix: Fix `Backlinks` not applying the display class
Fix#518
* fix: Apply `displayClass` to all layout components
* refactor: Use same style
* fix: Remove `undefined` class using coalescing operator