Add buttons to revert/drop commits

[dserv-nh]

When you change something via the panel but don't want to push it you currently have to use the command line to drop the commit (e.g. via git reset --hard HEAD~1 to undo the last commit)

I think it would be a great addition to add either a "Restore from remote" button or better yet a "Drop commit" button for all commits that are not pushed yet.

I can provide a PR for that but I want to hear a little bit of feedback on this first

[thathoff]

I actually planned to integrate something like this. Dropping a commit might need to make it more complicated as you need to check if you only revert commits that have not been pushed to remote yet or you need to allow force push to remote. So just reverting to the remote HEAD might be easier.

Nevertheless: PRs are very welcome! :)