Chore: Clean up root directory by moving HTML files

[MrCoder]

The root directory contains several HTML files that can be moved to more appropriate subfolders to improve organization and reduce clutter.

Suggested Moves:

• test-compression.html -> playground/test-compression.html
• test-url-params.html -> playground/test-url-params.html

index.html, embed.html, and renderer.html will remain in the root directory.

This change will make the projects root directory cleaner and the file structure more intuitive.