fixtures, utils refactor, template refactor for 'school' value

[Rafalkufel]

Currently we have school value hardcoded in fixtures. That value is passed as a whole to utils/DocumentData and then rendered in {{ school }} placeholder in templates.

We need to split it to separate fields for school name, type, addres, postalCode, city, and join them in DocumentData. In my opinion that data should be part of child data.