[CLEANUP] Merge Documentation of Deprecations and features

The Documentation snippets have been reviewed and moved into the 7.0
folder.

Resolves: #63433
Releases: master
Change-Id: I15428015da38753d0f4281af1f737a6e328c1de0
Reviewed-on: http://review.typo3.org/34783
Reviewed-by: Benjamin Mack <benni@typo3.org>
Tested-by: Benjamin Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>