Add VitePress docs site

Summary

• Add a VitePress documentation site under docs/
• Move repository docs into guide, target, and reference sections
• Simplify the root README and point documentation to https://fabrik.run
• Add Cloudflare Workers static asset deployment for the docs site

Cloudflare setup

The docs deployment workflow expects these repository secrets:

• CLOUDFLARE_API_TOKEN
• CLOUDFLARE_ACCOUNT_ID

The Worker is configured as fabrik-docs and routes fabrik.run/*.

Validation

• mise exec -- aube ci
• mise exec -- aube run build
• mise exec -- aube exec -- wrangler deploy --dry-run

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