💎 Showcase: Refinement

[google-labs-jules]

✨ Visuals: Added public/hero.png generated via Playwright.
🔗 Links: Created CONTRIBUTING.md and linked to it. Fixed broken links in README.md.
✂️ Trimmed: Refactored README.md to follow "Golden Template", removing duplicates and offloading content.
🛠️ Tools: Added scripts/generate-hero.js for future hero image updates.

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PR created automatically by Jules for task 332548277293304848 started by @TytaniumDev

[google-labs-jules]

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