[DOCS] rte_ckeditor: add a meaningful project title

This change adds a human readable and meaningful main
title for the documentation of ext:rte_ckeditor.

Resolves: #91136
Releases: master, 9.5
Change-Id: I01804d2d4c700af6c2a72d74596cf20b04505eb8
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64253


Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: TYPO3com <noreply@typo3.com>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>