Manual validation

This is a checklist to follow in order to perform a manual validation of the platform's proper functioning. This is especially useful when validating a "bump" pull request made by the dependabot, a fresh installation or any change in the code base.

1. Create a user account and login
2. Create a competition
3. Create a queue
4. Upload a submission
5. Check that the submission was processed (results, visualization tab, leaderboard)
6. Change/recover password
7. Delete user
8. Delete submission
9. Delete queue
10. Delete competition
11. Admin page
12. Look at the logs for any problematic messages (docker compose logs -f)