Adds seite to the generators directory.

seite is an AI-native static site generator built in Rust with:

• Built-in MCP server (seite mcp) for AI agent integration
• Claude Code integration (seite agent spawns Claude Code with full site context)
• 10 bundled themes + AI theme generation
• Sub-second incremental builds
• llms.txt generation for LLM discoverability
• Multi-language support, RSS, sitemap, JSON-LD, search index
• MIT licensed: https://github.com/seite-sh/seite

Uses Tera templates (same as Zola), deployed to GitHub Pages / Cloudflare Pages / Netlify.