GP: add transitions

[MartinKolarik]

The GP site has essentially no transitions for user actions/state changes. Lots of improvements possible there.

[jimaek]

Do we need a designer here? Or Kiril could handle this after the more important tasks by himself?

[MartinKolarik]

@xbpcb what do you think?

[xbpcb]

Yeah, why not. I’ve been thinking about few possibilities for improving.

[MartinKolarik]

Ok, let's see where we can get.