Room scrolling issues on the Index page

[Ckrapock]

Outside the perf issues as I'm sure you have been notified, here are some elements of navigation comfort:

1 - When I reach the far right of the rooms and i can't go further, the arrow still stays visible. Should disappear so we know we have reached the end

2 - When clicking on the right arrow, it's never ending. Should stop and the arrow disappears when reach the far left (and the most played room)

[mchev]

Fixed by the new design