Basic structure for MenuItem on Home

Summary: Ref T11957, builds out /home/menu/ as a basic structure for adding/editing the homepage menu.

Test Plan: visit /home/menu/ and add items to global and personal. Not wired to anything.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T11957

Differential Revision: https://secure.phabricator.com/D17180