Rebrand: Change Server name
Use the name "Phorge" as the defined platform.
Also prepare to rename the core library "phorge" rather then "phabricator" - see next diff.
Test Plan: Deployed change, tooltip for "Config" shows "Configure Phorge"
Reviewers: O1 Blessed Committers, speck
Reviewed By: O1 Blessed Committers, speck
Subscribers: speck, tobiaswiese, valerio.bozzolan, Matthew
Maniphest Tasks: T15006
Differential Revision: https://we.phorge.it/D25046