feature: implement group preferences

[iamgiolaga]

Discussed in #16

^{Originally posted by iamgiolaga November 12, 2022}
At database level, everytime a new match is started (and the previous one is deleted) a row is deleted and created.
With this approach we can never keep track of group preferences.

What if the groups has the habit of weekly organizing matches? They would want to set the usual time, the usual day, pitch, etc...