make bio vizualization work in handheld media

[waldyrious]

It currently depends on the :hover status; should be adapted to work with clicks (probably :active).

[waldyrious]

It currently depends on the :hover status; should be adapted to work with clicks (probably :active).

Actually, it seems to already work like that, but I'm keeping this issue open to track another problem with handheld devices: the bubbles are way too small at the moment for comfortable tapping. They should be made larger.