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

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• 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.
• ...

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[mwestphal]

this will look strange with white background ? Unless there is a gray background ?

[Meakk]

The goal is to be able to tweak the background on the website to improve integration without having to regenerate baselines

[github-actions]

Style Checks CI failed:

diff --git a/vtkext/private/module/vtkF3DRenderer.cxx b/vtkext/private/module/vtkF3DRenderer.cxx
index 150e44c..e5f2fad 100644
--- a/vtkext/private/module/vtkF3DRenderer.cxx
+++ b/vtkext/private/module/vtkF3DRenderer.cxx
@@ -3725,5 +3725,6 @@ vtkMatrix4x4* vtkF3DRenderer::GetGridMatrix() const
 //----------------------------------------------------------------------------
 double vtkF3DRenderer::GetScreenSpaceScaling() const
 {
-  return this->AntiAliasingModeEnabled == vtkF3DRenderer::AntiAliasingMode::SSAA ? std::sqrt(5.0) : 1.0;
+  return this->AntiAliasingModeEnabled == vtkF3DRenderer::AntiAliasingMode::SSAA ? std::sqrt(5.0)
+                                                                                 : 1.0;
 }