Website broken with the switch to the new labels enums

[COM8]

There are multiple problems:

• The location for the canteens.json changed from https://tum-dev.github.io/eat-api/canteens.json to https://tum-dev.github.io/eat-api/enums/canteens.json
• The website still uses the old ingredients instead of the new labels introduced by #60

@Philipp000 or @lukasdenk could one of you have a look at this please?

[Philipp000]

I will work on this