In all fairness, even the smallest contributions can be valuable. Well, as long as the contributor actually does something useful, and doesn’t just farm “fake” contribs.

You can probably use something like

git clean -xdf

To get rid of all the artifacts not tracked by git, in this case it’s virtually the same as deleting the repo and re-cloning it.

NOTE: Make sure everyhing is staged, otherwise that data is gone

The fine line between ssh and lsd