[Backport 12.4] [TASK] Update system requirements chapter #499 (#636)

* [TASK] Update system requirements chapter
#499

Releases: main, 13.4, 12.4

* [TASK] Change system requirements chapter
    #499

    Releases: main, 13.4, 12.4

* [TASK] Add SQl
    #499

    Releases: main, 13.4, 12.4

---------

Co-authored-by: Sarah McCarthy <[email protected]>

Author: github-actions[bot]

Documentation/Installation/SystemRequirements/Index.rst

@@ -8,7 +8,7 @@
 System requirements
 ===================
 
-For up-to-date information about TYPO3's system requirements visit `get.typo3.org
-<https://get.typo3.org/version/#system-requirements>`_.
+You will need a webserver, an up-to-date version of PHP and an SQL database. See
+here which versions of TYPO3 are current and their requirements
+`get.typo3.org <https://get.typo3.org/version/#system-requirements>`_.
 
-..  todo: Add more basic information