delete .git folder

rm -rf .git

git rm -r --cached some-directory
git commit -m 'Remove the now ignored directory "some-directory"'
git push origin master

rm -rf .git

git init
git add README.md
git commit -m "first commit"
git remote add origin https://github.com/Leonuch/flex.git
git push -u origin master

This code will remove a git folder