Change the Makefile and webpack config to reflect the new structure of
where we keep the frontend generated files.
Use the 404 static pages when requests are made to paths not found.
Add a small doc describing the available http routes.
At the moment the server side doesn't support SSL for the web end.
The tty_sender supports TLS for the server connection, which is
specified via a command line argument.
The websockets connection on the frontend side is using an address based
on the window.location.protocol (ws:// or wss://)
