Support more monsters in a room

[oskarrough]

Currently there's literally not UI space to have more than 1-3 monsters per room. Would be cool if the layout is flexible enough to fit say 6 monsters in total.

The game logic shouldn't care how many we add. I believe that'll work out of the box. But we need some smart CSS.

Thanks for the feedback@Sup3rAw3som3Cod3r