Docs: Follow-up from "Add Web IDE docs"

The following discussion from !4153 (merged) should be addressed:

• @marcia commented on a discussion: (+2 comments)

  Cool, good catch, thanks @jramsay!

Marcia:

I'm looking at it again, and still doesn't feel right. We need to move some of the other features that are project-related, and they are not directly underneath issues, MRs, or repos. Like, wiki, snippets, etc. Let's leave it as is, but I'll create an issue to follow up later.

cc/ @axil