Change order of FIFO / deadline / winner

[xavierlepretre]

Implementation of the expiration of Checkers games takes place over 3 pages:

• implement FIFO
• add deadline
• add winner

Change the order to:

• add deadline and winner in a single page because they are very correlated.
• implement FIFO

Before these 2 pages, there will be an explanation of what is to be done.

Between these 2 pages, there will be a wrong pseudo-code implementation ending with a variation of "lol you're so screwed".

[xavierlepretre]

It is taken care of.