Update Support diviner document
Summary: This updates the support document, specifically, scopes down feature requests, updates community links, and other wordsmithing. Unsure where to direct bug reports right now, but we'll have something soon?
Test Plan: Read carefully
Reviewed By: epriestley
Subscribers: Luke081515.2, Korvin
Differential Revision: https://secure.phabricator.com/D18218