Update Conpherence Main UI
Summary: Uses standard sidenav width, more spacing in labels, added background around textarea, make background work in Firefox.
Test Plan:
Test Desktop, Mobile, and Tablet break points. Test Firefox and Chrome.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11993