I recently wanted to take a project from private to public, but I wasn’t real sure what was in the history. I think I committed a few sensitive keys during development. So, I looked up how to nuke your github history and ran across this stackoverflow post that I thought was invaluable. This is the answer that worked for me.

  1. Checkout

    git checkout --orphan latest_branch

  2. Add all the files

    git add -A

  3. Commit the changes

    git commit -am "commit message"

  4. Delete the branch

    git branch -D master

  5. Rename the current branch to master

    git branch -m master

  6. Finally, force update your repository

    git push -f origin master

https://stackoverflow.com/questions/13716658/how-to-delete-all-commit-history-in-github