I was hoping you were a Github ninja as I’m not even sure about how you rollback to a previous commit but there is also an easier way.

If you go to https://github.com/drikkes/drikkes.github.io/tree/5cc9da9bbc905629366f5cc1ba7c2d03d8b04763 and click the ‘Clone or download’ button and download as a .zip it will have all the files for that commit. You can use these to replace the current version of you archive (similar process to when you first create the archive on github)