🚧 WIP Candidate Headings and Paragraph with --nl prefix tokens

[jiromaykin]

Summary

utrecht headigns and utrecht paragraphs will in future all be replaced with the NL Design System Candidate versions, with --nl suffix
https://nldesignsystem.nl/heading/
https://nldesignsystem.nl/paragraph/

1. Here we add all the new --nl candidate Paragraphs and Headings
2. and keep Utrecht legacy styling until all can be replaced.
3. This PR may also be helpful for https://dimpact.atlassian.net/browse/PP-323 and https://dimpact.atlassian.net/browse/PP-324

REM font-sizes as adviced bij NLDS:

16px → 1rem
20px → 1.25rem
24px → 1.5rem
26px → 1.625rem
30px → 1.875rem
32px → 2rem
34px → 2.125rem
40px → 2.5rem
41px → 2.5625rem

Also removing pixels/rems from the lineheights:
"...De waarden zijn 'unitless' (zonder eenheid) genoteerd, zodat de regelhoogte automatisch meebeweegt met de gekozen lettergrootte."

Issue References

• GitHub Issue: updates PR in OIP package 🏷️ [#2203] Add NLDS --nl prefix candidate Paragraph as web component open-inwoner#2246

Checklist

• Bumped version number in both package.json and in package-lock.json (can also be done after merge with npm version ...)