Guests support

[Zemanzo]

Description Currently, players are required to log in to Discord to play the game. To lower the entry barrier, a guest mode should be implemented.

Minimum Acceptance Criteria

• [ ] Players can enter marbles as a guest
  • [ ] They cannot have a nickname
• [ ] Guests cannot have their statistics tracked (such as points earned)
• [ ] Guests will not count towards the point pool
• [ ] The amount of guests that can enter will be limited (configurable amount, 20 by default)
• [ ] To reduce the chance of duplicate entries, store a cookie with a unique ID to prevent people entering as a guest multiple times