style: add header margin block tokens

[scar055]

Deze tokens accordion header tokens die ik heb toegevoegd, zijn nodig om de white space tussen de expand button en de content weg te halen.

Die tokens waren er eerst wel voor dat we de html heading hadden toegevoegd.

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Name	Status	Preview	Comments	Updated (UTC)
utrecht	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 26, 2024 0:11am

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.75%. Comparing base (cc8950b) to head (5391490). Report is 56 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2393   +/-   ##
=======================================
  Coverage   97.75%   97.75%           
=======================================
  Files         146      146           
  Lines        1113     1113           
  Branches      217      214    -3     
=======================================
  Hits         1088     1088           
  Misses         24       24           
  Partials        1        1           

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