Display volunteers on the event page

[beverloo]

They kinda need to be listed there :). Need to figure out what the nicest way is.

Should also consider Jacco's suggestion:
AnimeNL/volunteer-portal-api#1

[beverloo]

Fixed w/ 6380fd6, cc874fb, a72ee39 and some other ones. Still not ideal, but as good as it's going to get for this year.

[beverloo]

Michel suggests that we can scroll down to the applicable shift. That should be doable and solves much of the problem.