Add GitHub Pages documentation site

[xiangfu0]

Summary

• Add a modern, responsive single-page documentation site (docs/index.html) with dark theme, featuring: hero section, feature grid, 15 MCP tools reference table, step-by-step quick start guide, tabbed integration examples (Claude Desktop, HTTP API, Docker, Kubernetes), screenshot gallery, and configuration reference
• Add GitHub Actions workflow (.github/workflows/pages.yml) to deploy the site from docs/ and assets/ directories using actions/deploy-pages

Setup required after merge

• Go to Settings > Pages and set the source to GitHub Actions
• The site will be available at https://startreedata.github.io/mcp-pinot/

Test plan

• Open docs/index.html locally in a browser and verify all sections render correctly
• Verify responsive layout on mobile viewport
• Verify navigation links scroll to correct sections
• Verify tabbed integration section switches between Claude Desktop / HTTP / Docker / K8s
• Verify screenshot images load correctly (referenced from assets/)
• After merge, enable GitHub Pages via Actions and confirm deployment

🤖 Generated with Claude Code