Add phabricator.wolfplex.org alias

Summary:
Wolfplex has two domain names, wolfplex.be and wolfplex.org

They tend to use .org mainly, but Mailgun is configured for .be

So it makes sense currently to use .be as main domain, and .org as alias.

Test Plan: Browse both URL

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D1927