[#1378] Updated new menus to use dynamic pages

[Bartvaderkin]

This assumes you have the authenticated pages as children of the homepage in the tree, and use 'home' as ID in the page's advanced settings.

The products/onderwerpen are still rendered as they were, until we move the content to actual pages.

Note I also added a context manager that adds some data to check if an app is active.

Relates to #591

[jiromaykin]

Seems to work great!
I assume the icons before the pages will be added later on as an option?
Or is that already active somewhere?

[jiromaykin]

@alextreme and @Bartvaderkin I rebased my own branch from PR591, which maybe resulted in conflicts in this branch?
I hope this branch can be approved so everything can be merged and I can clean up the menu and remove all unnecessary comments in Pull Request 591

[codecov-commenter]

Codecov Report

Merging #613 (458dc2f) into develop (50768aa) will decrease coverage by 0.12%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #613      +/-   ##
===========================================
- Coverage    96.52%   96.40%   -0.12%     
===========================================
  Files          577      579       +2     
  Lines        19891    19942      +51     
===========================================
+ Hits         19199    19226      +27     
- Misses         692      716      +24     

Impacted Files	Coverage Δ
src/open_inwoner/conf/base.py	95.37% <ø> (ø)
src/open_inwoner/cms/context_processors.py	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[alextreme]

Could use some caching to avoid determining the active apphooks on every request, but considering it's a single query this should be okay for now