Purify re-frame handlers

[werenall]

Some of our re-frame event handler are impure according to the guidelines mentioned here and there. A good example of those antipatterns is this line [1] and this handler [2]

Keep in mind that those two examples are... well, just examples. The scope of this issue covers also seeking for other occurrences of the said antipatterns.

[1] - here a coeffect should be used
[2] - here we should probably write an fx (effect) that would create a js/Keycloak object and doto all the methods like .init, .error etc.