Add CLI option illustrations

[Meakk]

Describe your changes

Issue ticket number and link if any

Checklist for finalizing the PR

• I have performed a self-review of my code
• I have added tests for new features and bugfixes
• I have added documentation for new features
• If it is a modifying the libf3d API, I have updated bindings
• If it is a modifying the .github/workflows/versions.json, I have updated docker_timestamp

AI Disclosure

• I did not use AI to generate any of the content of that pull request
• I used AI to generate code in that pull request, if yes please disclose which part of the code was generated and with which model.

Used VSCode AI autocompletion (model: Claude Sonnet)

Continuous integration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.00%. Comparing base (4dcbd5d) to head (e2d9c5c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3239      +/-   ##
==========================================
+ Coverage   96.95%   97.00%   +0.05%     
==========================================
  Files         212      212              
  Lines       17642    17642              
==========================================
+ Hits        17104    17114      +10     
+ Misses        538      528      -10     

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[mwestphal]

some questions and remarks