[FEATURE] Add field description

Add a seo description field + reorganize fields in the TCA

Change-Id: Iff86b0b7b81a3b0ce0fad1cedd4751e796fc0cad
Resolves: #49450
Reviewed-on: https://review.typo3.org/25399
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer