Core feature, must be completed as soon as possible.
### Tasks
- [x] make a docker-container for a development database that'll run locally
- [x] fix broken mappedBy= statements
- [x] fix broken createdBy statements
- [x] redo every connection table, they are probably all broken
- [x] Add keycloak to docker-compose DEBUG initdb.sql
- [x] Refactor the quiz and the questions entities
- [x] Make the first fetch in the frontend
- [ ] Add application-docker.yml
- [x] Secure endpoints with keycloak auth
- [x] Add endpoints with static data
### Question type implementations
- [x] Text
- [x] Radio
- [x] Pair
- [x] Order
- [x] File
- [x] Checkbox
Core feature, must be completed as soon as possible.