🎨 [#1168] Make Theme cards entirely clickable

[jiromaykin]

See issue: https://taiga.maykinmedia.nl/project/open-inwoner/task/1168
Theme/Category- cards need to be entirely clickable, unless they show Subthemes/Products.

[codecov-commenter]

Codecov Report

Merging #519 (f8a1647) into develop (4b09a8c) will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #519      +/-   ##
===========================================
+ Coverage    96.48%   96.52%   +0.03%     
===========================================
  Files          527      527              
  Lines        19003    19023      +20     
===========================================
+ Hits         18335    18361      +26     
+ Misses         668      662       -6     

Impacted Files	Coverage Δ
src/open_inwoner/utils/ckeditor.py	75.00% <0.00%> (-17.31%)	⬇️
src/open_inwoner/pdc/models/category.py	89.18% <0.00%> (-8.11%)	⬇️
...rc/open_inwoner/pdc/tests/test_product_location.py	100.00% <0.00%> (ø)
.../open_inwoner/components/templatetags/link_tags.py	100.00% <0.00%> (ø)
src/open_inwoner/pdc/models/product.py	89.70% <0.00%> (+0.31%)	⬆️
src/open_inwoner/pdc/views.py	88.10% <0.00%> (+0.37%)	⬆️
src/open_inwoner/utils/templatetags/utils.py	90.00% <0.00%> (+27.50%)	⬆️

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[jiromaykin]

The biggest challenge here was the fact that it is impossible to have a-hrefs inside a-hrefs in HTML, so these are the same card but with an if/else state to see if thay contain Subthemes/Products or not - in future i will need to simplify these, but this is for the Theme cards only for now: