Make sure root level excludes are prefix with
a forward slash (/). The /bin folder exclude
is already fixed by a previous commit in master.

Sort the .gitignore into logical groups.

Releases: 7.6, 8.7, master
Resolves: #81992
Change-Id: If1cb4105e57fb7ab3c28448abc3eaeb898da60e3
Reviewed-on: https://review.typo3.org/53612


Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Tested-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Henning Liebe <h.liebe@neusta.de>
Tested-by: Henning Liebe <h.liebe@neusta.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Helmut Hummel <typo3@helhum.io>
Tested-by: Helmut Hummel <typo3@helhum.io>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>