Summary: Ref T3979. Currently, the home page lives in an old application called "directory" and is informally defined. Make it a real application called "Home", with a formal definition. It isn't launchable and can't be uninstalled.
Test Plan: Loaded home, saw exact same stuff.
Reviewers: chad, btrahan
Reviewed By: chad
CC: aran
Maniphest Tasks: T3979
Differential Revision: https://secure.phabricator.com/D8074
