[TASK] Add fileadmin and uploads to gitignore

Resolves: #63454
Releases: master
Change-Id: Id6e62751c735db5ecf7806ed70f6f9ed6aa96eee
Reviewed-on: http://review.typo3.org/34817
Reviewed-by: Felix Kopp <felix-source@phorax.com>
Tested-by: Felix Kopp <felix-source@phorax.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>