Improve integration/deployment of web front-end #59

Currently, the web front end is in the www directory. It has to be deployed separately from the Spotbit server.

We would like this web front-end to be served from Spotbit servers /. That is:

Done in #79

• Move the code and assets in www to the templates and static directories.
• Rewrite server.py: @app.get('/') to serve the front-end.

TODO

• Remove the www directory.
• Update the code that parses Spotbit responses (use Typescript where possible).
  • templates/index.html uses a proxy.php endpoint. This should instead use the new Spotbit endpoints (whose documentation can be found at the /docs endpoint of a running Spotbit instance).
• Update installSpotbit.sh or add documentation that describes how to host the front-end in clearnet using Apache or some other reverse proxy e.g. Caddy. (see https://fastapi.tiangolo.com/deployment/)