[MugdhoAI]

Summary

• Add a custom dark blue SVG hero banner designed around the sqlite-c project, with a database mascot, SQL examples, B-tree structure, and page-storage visuals.
• Redesign the top of the README to follow the supplied reference image: hero banner, project identity, concise status badges, short project description, and a five-part feature row.
• Keep all technical claims aligned with the implementation and explicitly state that the file format is not SQLite-compatible.
• Preserve the existing detailed documentation below the new introduction.

Verification

Reviewed the README changes and checked that the referenced banner is committed in docs/images/sqlite-c-hero.svg. This is a documentation-only change.