Add Nginx service as proxy for tsm frontend and add WSGI to frontend image

At the moment the frontend is delivered by djangos development server mode and is not production ready. We'll need a WSGI and a webserver as proxy, to deliver static contents and as TLS endpoint. We also need to decide if we want to move the minio frontend from port 443 to another port or behind a subpath of the proxy to make the standard port 443 free for the user interface.