Favicon+clean-code+icons

[damien-schneider]

• Updated the favicon by removing "shortcut" from the rel attribute to ensure better compatibility.
• Removed jQuery and replaced the old jQuery scripts with vanilla JavaScript to improve performance.

  I'm unsure about the quality of this new script if you can check briefly it could be nice.

• Replaced the old Ionic icons with SVGs from the Lucide icon library to modernize and unify the visuals.
• Enhanced the design by adding colors to different sections. Introduced a custom theme to highlight.js to enhance syntax visibility.
• Updated the documentation by adding highlights.js explanations & roadmap updates

[adumesny]

thank you! looks great.