WIP: As a Superadmin, I want to create departments

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Fields: name, address (street, place, zip), contact informations (phone number, email, opening hours)
Only superadmins can create departments and assign users to departments
Department Managers can update the departments fields
Department Managers can't change the assigned Department Manager
A Departments has_and_belongs_to_many Department Managers
After logging in as Department Manager he should see his department
In the navbar is a link to Departments index only visible for superadmins
As Department Manager there is a link in the Navbar to his department

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