Merge in FRAG/50ohm.de from feature/unit-html-renderer to main
* commit '4c82c9fb146332bd3abe8e2d1d0308aafbdc54d4':
refactor: improve code readability
feat: improve tests for unit rendering
refactor: use helper to format unit
refactor: create module
feat: render units with non-breaking space
Merge in FRAG/50ohm.de from feat/fifty-ohm-html-renderer to main
* commit '19135655ca5c8eba65b8138470aa3a6558ae2da7':
feat: implement custom comment syntax