[TASK] Combine modules "about" & "about modules"

To simplify the backend user interface the module "About module"
is merged into the module "About TYPO3 CMS".

Resolves: #81474
Releases: master
Change-Id: I643a93e351cc32109ee41f2543d491c63400e0c8
Reviewed-on: https://review.typo3.org/53127


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>