I would appreciate it if someone could tell me how I could delete every single file/folder on my git repository without actually deleting the repository itself. I want to delete all history associated with those files as well.
You can delete a branch from a repository remote like this
git push origin :branchname
if you've got any tags you can delete them like this:
git push origin :refs/tags/tagname
This is assuming you have a remote set up to github called origin
This will leave the local tags / branches on your computer, though.