[TASK] Remove Documentation/Settings.yml

The files were substituted with "Settings.cfg" a while
ago and are now obsolete according to the docs team.

Change-Id: I43f2a6fca83f839359d5c1b0c1bb4f0cf967e253
Resolves: #78595
Releases: master, 7.6
Reviewed-on: https://review.typo3.org/50527


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>