improve gallery

[MeWu-IDM]

Pull Request Summary

Rename the files and improve content

Checklist

• [ X ] Folder structure: My examples are checked-in to a new folder under python/samples or r/samples.
• [ X ] Testing: I have tested this example locally and successfully rendered it using quarto.
• [ X ] Documentation: I have provided documentation, inline comments in my notebook or quarto markdown files.
• [ X ] Dependencies: I have provided requirements.txt or other dependency installation steps needed to reproduce the example.
• [ X ] Code Quality: Code is clean, organized, and well documented.

Additional Context (Optional)