Clean up random junk in Conpherence
Summary: Fixes T10781. Re-uses sidenav styles from global space, though a little hacky. Fix crumb border, fix nux experience. Fiddle spacing.
Test Plan:
Use Conpherence as new user, make a room, post some messages.
{F1805658}
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin
Maniphest Tasks: T10781
Differential Revision: https://secure.phabricator.com/D16528