Use Pre-made prompts feature

[jacten]

If players don't want to write prompts. They have the option to use pre-made prompts. Eventually, this could hook into the prompt API (if we decide this is worth doing). Or if no API could still have separate prompt "Packs" to choose from with various themes.

The goal for right now is to design and implement a pre-made prompts feature. How i imagine it would work.

v1: a boolean on createGame method called usePreMadePrompts.
v2: Perhaps create game without deciding and go to a second screen with three prompt packs to choose from. Those prompt packs can rotate with different prompts each day.

Server-side: random prompts are chosen from prompt pack and added to the game equal to number of players and turns.

After waiting room is ready, jumps directly into gameplay (no prompt writing duh). Rest should be about the same.