💄 [#1257] Underline anchors in some content

[jiromaykin]

issue: https://taiga.maykinmedia.nl/project/open-inwoner/issue/1257

• add underline for links in productpage content
• add underline for links in FAQ content + black when closed, blue when open + fix incorrect arrow direction.
• check with designer whether links should be strong

After consultation with designer: all links inside content should be underlined, also if they are inside location-cards and faq's; they do not need to be bold.

NB: the strange spacing before links is corrected in a different PR that deals with the weird link-spacing in leaflet /maps.

[codecov-commenter]

Codecov Report

Merging #561 (2025d6a) into develop (6806072) will increase coverage by 0.23%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #561      +/-   ##
===========================================
+ Coverage    96.49%   96.73%   +0.23%     
===========================================
  Files          546      547       +1     
  Lines        19467    19425      -42     
===========================================
+ Hits         18785    18790       +5     
+ Misses         682      635      -47     

see 16 files with indirect coverage changes

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