Pr backend serve

[alan412]

This makes a backend that will serve the frontend and also do deployment.

To use it:

1. npm run build (creates a dist directory)
2. source backend/venv/bin/activate
3. python backend/main.py -p xxxx (port you want)

If you press deploy and you are running it from the npm run dev, then it will work like it has been where deploy downloads a zip file. If you press deploy and you are running it from the python backend script then it will unzip the zip file in a deploy directory under the directory the backend runs from.