Soft-launch project boards
Summary: Ref T1344. I don't think we'll need to destroy any data moving forward, and would like to get more feedback about what changes users want.
Test Plan: Looked at a project and clicked onto its board.
Reviewers: chad, btrahan
Reviewed By: chad
Maniphest Tasks: T1344
Differential Revision: https://secure.phabricator.com/D8191