Add second level of category page
Add two new icons for use on the category page
Add new colour variables
Add category page HTML to controller
Add category filter nav partial
Style category page layout
Style category element
Style category filter
Apply filter styling
Add temporary icons
Style category list
Extract intro into new class
Add aria roles to nav filter
Fix border issue
Hide category filter on mobile
Extract category details into a partial
Remove redundant nav element
Style the category filter's padding