Add Contact Information to Phortune Merchants

Summary: Part of making this look/feel/be more professional is having decent receipts for billing, including contact information (whatever we want to put in there). I'm not using this anywhere at the moment, but will.

Test Plan: Add Contact Info, see Contact Info. Also, why is Remarkup not rendering with line breaks? Seems to be a OneOff thing... anywho... bears!

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T7607

Differential Revision: https://secure.phabricator.com/D14125