Implement registration form

[dheidemann]

google forms api sucks, implemented registration form functionality myself now.

Each umbrella event can have a registration form now.
I seed a default form for a umbrella event with id 1.
Therefore the registration form can be found at http://localhost:8080/registration?e=1

For the reviewer: you dont need to check the backend stuff, just fronted please. Basically the only relevant file is frontend/app/registration/page.tsx

[Plebysnacc]

Validation Check is not always needed, makes the form invalid although valid answers may have been given

[dheidemann]

This is something i cannot represent in the datastructure. You would have to add another answer with 'Kenne ich alles' for example

[dheidemann]

Well you could add this 0 point answer and if it exists i skip the form validation and dont show the answer. A bit sketchy tho

[dheidemann]

Nevermind, i have a better idea, gimme 5 min

[Plebysnacc]

Is not having a notification for completed submission intended?

[dheidemann]

the submission flow is not part of this pr. This needs another table in the database and is going to be implemented afterwards

[Plebysnacc]

lgtm