Showcase: Refactor README for "Curb Appeal" and Simplicity

[google-labs-jules]

This PR refactors the README.md to align with the "Showcase" persona's "Golden Template" for improved first impressions and user onboarding.

Changes:

• README.md: Simplified to focus on the "Hook", "Hero Visual" (placeholder), "Quick Start", and "Key Features".
• docs/DEPLOYMENT.md: Created to house detailed setup, prerequisites, and deployment instructions, decluttering the main README.
• CONTRIBUTING.md: Created to provide a clear entry point for contributors.
• .jules/showcase.md: Initialized to track UX friction points (e.g., missing hero image).

Verification:

• Verified relative and absolute links in documentation.
• Ensured npm run commands in Quick Start are accurate.

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PR created automatically by Jules for task 7983374682078245161 started by @TytaniumDev

[google-labs-jules]

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