Update Install and Update Scripts to the new Paths and Repository links

Summary:
Set the Reposity links to actually install Phorge, Update Documentation links to the new Website.

Notes:

• Github Mirrors are not set up. Use one anyway? Or just use the Repos at we.phorge.it?
• Documentation Links still contain "phabricator". The Docs are changed, but the Diviner Books are not rebuilt. (Add a Cronjob or do it after every Commit?)
• mysql-server is not included anymore in Debian environments. Should mariadb-server be used?
• Should we print somewhere that Phorge is a Fork of Phabricator?

Test Plan:
Run the install script.
It should install Phorge and display Links to we.phore.it

Reviewers: O1 Blessed Committers, speck

Reviewed By: O1 Blessed Committers, speck

Subscribers: speck, tobiaswiese

Differential Revision: https://we.phorge.it/D25019