Enhance readme v2

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Pull request overview

This PR significantly enhances the README documentation by modernizing the presentation and improving clarity about JS-X-Ray's capabilities. The changes transform a technical-focused README into a more comprehensive and user-friendly document that better positions JS-X-Ray as a security analysis tool.

Changes:

• Added SLSA Level 3 badge to demonstrate supply chain security compliance
• Rewrote the introduction to clearly position JS-X-Ray as a SAST tool for JavaScript/TypeScript with a focus on security
• Reorganized and expanded the Features section with detailed categorization of capabilities (malicious code detection, vulnerable patterns, weak cryptography, etc.)
• Restructured documentation by moving the Contributors guide and Benchmarks sections, and adding the new js-x-ray-ai workspace to the workspace table

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