Normalize headers and actions in Project sub pages
Summary: Run through all the pages in projects and make sure they all feel similar. Adds back curtain on board manage page, even though it is sad for only having a single action.
Test Plan: Test all pages on a project for consistency in UI.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D17909