Git hooks should only check staged/committed files

[programLyrique]

The git hooks perform checks and tests on changes they are not supposed to check.

The pre-commit one should only perform checks (such as the formatting one) on the files added to the staging area.

The pre-push should perform checks and tests on the last commit, not on changes that have not been committed.

[Jakobeha]

The pre-push hook was removed, but Git doesn't propagate hooks so you must run rm .git/hooks/pre-push.sh. Sorry about that.

I just fixed the pre-commit in main (#11) so it only applies to staged files unless everything is staged, and can also auto-format the staged files instead of just throwing an error. I kept it so that it formats everything if everything is staged (even non-committed files) because it's apparently recommended, and spotless already caches so that it shouldn't be slower unless something mis-formatted is already comitted (see diffplug/spotless#178).

[programLyrique]

Thanks!

(I think the one to remove for pre-pushing is .githooks/pre-push.sh)