Filter menu integrated in unique url

[RubenFricke]

Is your feature request related to a problem? Please describe.
For the release for the AD students, a link should be able to get shared with a certain active filter bar. For example, a certain category already selected.

Describe the solution you'd like
The filter menu should be integrated into the URL. So certain states of the filter menu should be able to get shared.

[waltersajtos]

@RubenFricke is it okay if I do this in #475?

[RubenFricke]

@RubenFricke is it okay if I do this in #475?

Sure 👍!