Specify canteen via url parameter

[COM8]

Original: srehwald#51

Pretty much the title. i think being able to specify the canteen you're interested in via a query parameter would be really useful, and a lot faster than having to go through the dropdown menu, especially on mobile

[lukasdenk]

Isn't this already possible? In the main README, it gives this example to get the menu from the mensa in Garching: https://tum-dev.github.io/eat-api/mensa-garching/2019/20.json

[lukaskollmer]

@lukasdenk for the json-returning API, yes. I was talking about the website displaying the menu as an HTML table.

[lukasdenk]

Ok, I'll try to fix it