Make Jitsi widget interface looks better and usable with low height

[MurzNN]

Often, when Jitsi widget integrated into other interface (eg Riot.im messenger) with low height, his usability is very bad, here is some screenshots from Riot.im with height=273px:

• tile view with 3 users:
  
• tile view with 3 users hovered:
  
• list of users in conference can't show even one user:
  

Will be good to fix this issues for make Jitsi widget more usable with low height.

[luixxiul]

I would reorder the tiles horizontally with display: grid with media queries.

[l3d00m]

Hi @MurzNN, thanks for providing the good example images. I'm going to close this is in favour of #5142 to keep the discussion in one place.