More info can be find in the README in the inside folders frontend and backend
To deploy you must have the following remotes and permission to push to them
heroku-backend https://git.heroku.com/mind-the-news-backend.git
heroku-frontend https://git.heroku.com/mind-the-news-frontend.git
Then you can submit a git subtree to each one of them
git subtree push --prefix backend heroku-backend master
git subtree push --prefix frontend heroku-frontend master