Store the scroll jumps per puzzle

[jkenlooper]

The scroll jumps should be saved to (temporary?) storage on the server for a puzzle per player. This would allow a player to return to that same puzzle and have all the scroll jumps still be set. This could initially be done using the browser LocalStorage, but if the player uses different devices; it'd be better if that was stored on the server.

Questions

• Would it be useful to share the scroll jumps for other players to use?