Editable content for taxonomy pages

[thmarx]

The current implementation of taxonomy uses two templates taxonomy.html an taxonomy.single.html. To add custom content to a single taxonomy page we need to add a template for a single tax and include it. so we can have custom content. But that content is not editable via manager. I think we need some way to add content pages for taxonomies.

maybe something like that:
taxonmy brand -> nike

url brand/nike resolves to the taxonmy
when I add a content page brand/nike.md this page is ignored, maybe we can load the content from that page if exists and add the page into the template context?