Arcanist Update .arcconfig to point to we.phorge.it

Summary:
Updated .arcconfig to we.phorge.it

Refs T15006

I would also note, I created this revision using the container setup developed by @willson556 mentioned in T15011#370 and it worked great!

Test Plan:
Ran arc install-certificate and was able to get token from the right place and install it

Ran arc which saw that it identified we.phorge.it

Reviewers: speck, avivey, tobiaswiese, O1 Blessed Committers, eax, Blessed Committers

Reviewed By: speck, avivey, tobiaswiese, O1 Blessed Committers, eax, Blessed Committers

Subscribers: deadalnix, chris, willson556, speck

Maniphest Tasks: T15006

Differential Revision: https://we.phorge.it/D25003