[WIP] Refactor documentation to display markdown for CNS Studios authentication service

[Copilot]

Documentation Refactoring Plan

• Add TL;DR section at the top of the documentation
• Replace current documentation content with CNS Auth Service documentation
• Update sidebar navigation to match new content structure
• Add all sections from the problem statement:
  • Architecture Overview
  • Getting Started (Prerequisites, Installation & Setup, Running the Service)
  • How It Works: SSO Flow
  • Integrating a New Service (Step 1-3)
  • Secure API Usage (Authentication, Endpoints)
  • Environment Variables table
• Verify the page renders correctly with existing CSS
• Test the documentation page in a browser

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