PP-324 [#2203] refactor paragraph modifiers

[jiromaykin]

Summary

Refactor small/muted modifiers or replace them if they are part of NLDS components.
When paragraphs do not really function as actual text content, but function more like 'labels' they can be replaced with spans.
margin-bottom/top etc should be replaced with margin-block-start/end etc. so to give the opportunity to change them with separate future design tokens.
At least every utrecht-paragraph reference should be completely removed.

Advice from NLDS (not a hard requirment)

• do no use static font sizes in pixels (prefer REMs)
• do not use fonts smaller than 16px:
  https://nldesignsystem.nl/richtlijnen/stijl/typografie/lettergrootte/
• do not use centered text:
  https://nldesignsystem.nl/richtlijnen/stijl/typografie/uitlijning/

Some changed components:

Most templates do not have any style changes, and paragraphs should look the same before/after chaging them into NLDS web components.

Keeping the Case Cards in OIP design for now, so they will not look like the NLDS Case Cards and are keeping their smaller size font: https://github.com/orgs/nl-design-system/discussions/204

File list on Zaak detail, needs to remain in Groningen-tested design

Issue References

closes PP-324
Note this PR needs design-tokens from another PR: maykinmedia/open-inwoner-design-tokens#43
And note that there have been previous PR's that work together with all/more paragraph changes:

#2394
maykinmedia/open-inwoner-design-tokens#41
#2429
#2394
maykinmedia/open-inwoner-design-tokens#42

Checklist

• CHANGELOG.rst updated
• Codecov report reviewed for untested lines

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (nlds-para-heading-implementation@9a205ef). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/open_inwoner/cms/cases/tests/test_htmx.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@                         Coverage Diff                         @@
##             nlds-para-heading-implementation    #2430   +/-   ##
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  Coverage                                    ?   93.97%           
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  Files                                       ?     1221           
  Lines                                       ?    48676           
  Branches                                    ?        0           
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  Hits                                        ?    45742           
  Misses                                      ?     2934           
  Partials                                    ?        0           

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