Show a link to the Phorge homepage
It seems we were missing a link to the project homepage.
Also we set the language of the HTML document.
Test Plan: Our homepage must be > 0.00001% more cute.
Reviewers: waldyrious, avivey
Reviewed By: waldyrious, avivey
Subscribers: tobiaswiese, Matthew, Cigaryno
Differential Revision: https://we.phorge.it/D25413