Spiffy up new sidebar, simplify UI
Summary: Mostly a visual spacing pass, also adds in circle icons for edit, collapse. For now removing the fixed position on the icons for simplicity while the basics are being polished.
Test Plan: Projects, Profiles, wide and narrow.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D15081