Add users, orgs, and collections to app

[Prospector]

Still needs:

• Backend routes instead of temporary frontend fetches (assigned @Geometrically)
  • Fetching a collection from ID
  • Projects from collection ID (afaik does not exist in labrinth, but could maybe be made for app?)
  • Organization from ID
  • Projects from org ID
  • Projects from org ID
  • Projects from user ID
  • Organizations from user ID
  • Collections from user ID
  • Write routes for collections would also be useful in future?
  • Not implemented yet but read/write routes for followed projects as well?
• Fix breadcrumbs for user, collection, and org pages (I couldn't really understand how they work, assigned @Geometrically)
• Bug testing

Closes MOD-13
Closes #581
Closes #1248

[worldwidepixel]

Just dropping my useless two cents that "Projects from collection ID" would be a very useful addition to Labrinth!