Summary: Moves CSS into 3 files, Boards, Panels, Cards. Cleans up Workcards to present more info, hide edit until card hover.
Test Plan:
Lots of photoshop. Verify links to edit still work.
{F1081276}
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D15137
