Remove lobby_api querying

[Brutus5000]

This is unused since new website (was bugged anyway) and currently stops moving the website to Kubernetes.

[fcaps]

there was a comment from @JaviTrek

### lobby_api
reinstated after it seems it is actually being used and is not some useless piece of code. It provides users with a mirror of the users, their maps and lobbies in the FAF client.

But nonetheless, it's broken.
Can you also remove the LOBBY_API_URL in .env.example, env.faf-stack and in the faf-stack repo?
Also the readme can be updated The website has dependencies to

[fcaps]

lgtm :) thx for the update

[fcaps]

you know where it was used? in the old game-client?

[Brutus5000]

It used to show the number of current players online and games played. At some point there was also a world map where we showed where the players are.

[Brutus5000]

But this could be brought back with a proper grafana chart integration maybe.

[fcaps]

i see, was curios where this was used, did not find any ref in the game-client