[DOCS] Adjust configuration of manuals and changelog

* Adjusts all configuration files using the main branch
  instead of master
* Makes all "Edit on Github" links in the Changelog and
  System Extension manuals work again after master -
  main switch.
* Fixes all link to Github or Docs using the path
  containing main instead of master

Resolves: #96138
Releases: main, 11.5, 10.4
Change-Id: Ifde73dd2bb8efdbf54eb2ba7625d6f201de9bd11
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72382


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>