Ability to remove a user from wiki#169

Currently there is no way to remove a user from the wiki in YNAW.
There is only the ability to set a user as Edit or read only.

Potential solutions:

• Remove item as part of the list
  • After clicking it, a small popup shows to allow a user to undo
  • OR modal to confirm

Further detail:
I’m having some trouble removing sharing with users though. How do I remove sharing with someone?

I can only see the choice between “Editor” and “Reader” in the shared user options.