Make creating cryptoparties more interesting

[valberg]

Right now, creating a cryptoparty doesn't do any more than any other generic calendar does. We should try to go beyond that.

What I propose is a way of saying "this cryptoparty is going to be about these topics". This means that we'll make it possible to relate multiple Topics to a Party.

To extend on that subject we might look into making Topic even more advanced as external resources, self-written documentation, step-by-step tutorials etc.

Other suggestions are welcome - how do we get this project going where people actually use it? (A better design and UX is a good start 😜)