Add a navigation to section/pages in the nested view of the management

[jochenklar]

Rationale / Begründung

Adding a navigation to section/pages in the nested view of the management would improve the catalog editing, and should not be to hard to implement. A click would scroll the element in to the view.

Affected

Managers, Admins

[MyPyDavid]

we could make a start with this issue with our new colleague from the ULB (same for #745 ;) )