FEATURE: Onebox local categories (PR #11311)

Create stylish and functional oneboxes when linking to local categories on your Discourse site.

GitHub

if category_slug_path_with_id is not found can users see it? perhaps double check for nil here?

Looks like can_see_category? should take care of that for us:

https://github.com/discourse/discourse/blob/master/lib/guardian/category_guardian.rb#L50

cool, ok merging this!