Shuffle project information around on detail page

Summary:
Ref T4007. Fixes T4009. Ref T4008.

  - Move blurb to a text section.
  - Make it render as remarkup.
  - Put policy information and status information in header.

Test Plan: See screenshot.

Reviewers: chad, btrahan

Reviewed By: chad

CC: aran

Maniphest Tasks: T4009, T4007, T4008

Differential Revision: https://secure.phabricator.com/D7373