♿ [#2345] A11y replace disallowed heading tags in Cards

[jiromaykin]

issue: if there is no content, then there should not be any headings.
Taiga: https://taiga.maykinmedia.nl/project/open-inwoner/task/2345

Cards that only have an image and no text content at all, should use a paragraph that may visually look like a Heading.
A real Heading is an HTML tag that should summarize/pin-point the section below it, but in case of an image it does not make sense in accessibility/meaningfulness.

Also screen-readers will read out headings as a list with hierarchy, so there better be something meaningful there.

Note : it is outside of the scope of this issue but some of the other cards are incorrect as well - in case a card has only a title, it's again not really a heading. Example: the sub-category card here: https://open-inwoner-test.maykin.nl/onderwerpen/vervoer/
And on the Profile page it is better to just consistently use paragraphs, since many of the 'Overzicht' cards do not have 'meaningful' content when read by a screenreader as a hierarchical list.

Perhaps none of the cards need a true Heading tag, but at least our 'Aanvragen/Vragen/Samenwerkingen' cards have a lot more content that may benefit from having a heading.

Also note: NL Design System has its own Card component, which we are not using yet in OIP.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.22%. Comparing base (12c451b) to head (4b182c2).
Report is 60 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1224      +/-   ##
===========================================
+ Coverage    95.21%   95.22%   +0.01%     
===========================================
  Files          968      973       +5     
  Lines        35256    35446     +190     
===========================================
+ Hits         33568    33755     +187     
- Misses        1688     1691       +3     

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[jiromaykin]

@alextreme You are also allowed to review this one, since it's quite simple.