git start over
# checkout the master branch
git checkout master
# create a new branch so you can find the old code easily
git branch oldStuff-KeepingForReference
# push the branch to github
git push origin oldStuff-KeepingForReference
# You currently have the master branch checked out
# so now cd to the project root and start your rewrite:
cd <your project root>
rm -rf *
# Create a commit of the delete
git add --all *
git commit -m "Fresh start"
# Start your rewrite
echo "Some changes" > file.txt
git add file.txt
git commit -m "This is the first commit of the rewrite"