[#3076] page title change with cms page title

[linssen814]

Made it so that the browser tab title as well as the header of the 'Benefits', 'Collaboration' and 'Mijn Vragen' pages change with the page title configured in the cms.

Taiga: https://taiga.maykinmedia.nl/project/open-inwoner/us/3076

Note that for the 'Mijn Vragen' page, the way that the Page object is retrieved is kind of iffy, though it does seem to work. See the comment above it.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.13%. Comparing base (788a90a) to head (445a1e0).

Files with missing lines	Patch %	Lines
src/open_inwoner/accounts/views/contactmoments.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1665      +/-   ##
===========================================
- Coverage    94.13%   94.13%   -0.01%     
===========================================
  Files         1088     1088              
  Lines        40150    40158       +8     
===========================================
+ Hits         37797    37804       +7     
- Misses        2353     2354       +1     

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