Ensure Aphlict is served on the primary domain

Summary: This ensure that Aphlict is always served on the primary / production domain, because the alternate file domain is intended to prevent Flash execution.

Test Plan: Confirmed this fixes the issue by visiting https://code.redpointsoftware.com.au/ and seeing notification messages.

Reviewers: joshuaspence, Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9511