Add "ordered by guess time" label when multiguess is on

[ReAnnannanna]

It also reworks the styling a bit with CSS grid. The buttons are now in the grid so there is no need for position: absolute hacks.

[ReAnnannanna]

The scoreboard header can now have different heights, and the score table doesn't adapt to this. I think that's hard to do with the current implementation. It still always shows all the scores, just has weird padding sometimes, so it's acceptable IMO. we can do it correctly if/when we move to vue