Improve README visual hierarchy and consistency

[Boopi7]

The README is detailed but long. Some sections could use clearer visual separation, consistent emojis, and spacing for better readability.

[Boopi7]

• Use consistent emoji headings (same format and tone across all sections).
• Add horizontal rules (---) between major sections.
• Ensure consistent indentation and bullet formatting.
• Move “Keywords” into italicized, single-line footers under each section.
• Add a short “Star this repo ⭐” note at the top and bottom for visibility.