R1:801a17627404

Link Phabricator from footer

Summary:
I need to visit Phabricator homepage (usually to read the docs) quite often.
This is also kind of a signature.

Test Plan: Clicked it.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3335