[TODO] Game Board: Add Concede Button

[Bratah123]

Abstract

This button replaces the Back button currently implemented.

Details

This button should disconnect the user who clicked it and their opponent.
This should clean up the Game instance the players are in and return each player back to the main menu.

Tasks

• Render Concede Button
• Handle toast/chat log notifications
• Save result to DB (if required)
• Return Both Players to Main Menu
• Disconnect both players in the game instance