Remove git history 

Make the current working directory into the only commit and remove the complete git history. Found on stackoverflow.

git checkout --orphan newBranch
git add -A # Add all files and commit them
git commit
git branch -D master # Deletes the master branch
git branch -m master # Rename the current branch to master
git push -f origin master # Force push master branch to github
git gc --aggressive --prune=all # remove the old files