docs: clean up readme formatting

[saurabhhhcodes]

Summary

• remove extra HTML break/blank spacing that made the README render unevenly
• convert loose setup, quality, contribution, and support text into proper Markdown lists
• fix heading spacing, code fence spacing, and small punctuation issues while preserving the existing project content

Fixes #533

Validation

• npm test
• npm run build
• git diff --check

[saurabhhhcodes]

Validation completed for this docs cleanup:

• npm test
• npm run build
• git diff --check

The PR only normalizes README Markdown rendering/spacing and keeps the existing project content unchanged. If this is accepted for GSSoC, please add the appropriate gssoc:approved, difficulty, and type:documentation labels so it can be scored correctly.