Add SEO optimization

- Add meta tags (keywords, author, robots, canonical)
- Add Open Graph tags for social sharing
- Add Twitter card meta tags
- Add hreflang tags for EN/FR language alternates
- Add Schema.org structured data (JSON-LD)
- Create sitemap.xml
- Create robots.txt
- Add workflow documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

doc/workflow.md

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+# Atomaste Website Workflow
+
+## Source of Truth
+
+**Master Location**: `C:\Users\antoi\WEBtomaste` (Windows)
+
+This is your primary working directory. All edits should be made here.
+
+## Architecture
+
+```
+WEBtomaste (Windows - MASTER)
+    |
+    +---> Gitea: http://192.168.86.50:3000/Antoine/WEBtomaste.git (version control)
+    |
+    +---> Syncthing ---> Dalidou:/srv/atomaste-dev (auto-sync for dev testing)
+    |
+    +---> Hostinger (production - manual deploy)
+```
+
+## Development Workflow
+
+1. **Edit files** in `C:\Users\antoi\WEBtomaste`
+2. **Changes auto-sync** to Dalidou via Syncthing
+3. **Test** at `http://192.168.86.50:8090`
+4. **Commit & push** to Gitea when ready:
+   ```bash
+   git add .
+   git commit -m "Your message"
+   git push origin main
+   ```
+5. **Deploy to Hostinger** when production-ready
+
+## Key Files
+
+| File | Purpose |
+|------|---------|
+| `index.html` | English website |
+| `fr.html` | French website |
+| `Media/Atomaste_light_grey_Logo.svg` | Main logo |
+| `Media/Atomaste_logo_A.svg` | Favicon |
+| `deploy.bat` | Deploy to Dalidou dev server |
+
+## Remotes
+
+- **Gitea**: `http://192.168.86.50:3000/Antoine/WEBtomaste.git`
+- **Dev Server**: `http://192.168.86.50:8090`
+
+## Syncthing Configuration
+
+- Folder: `atomaste-dev`
+- Type: `sendonly` (Windows -> Dalidou only)
+- Path on Dalidou: `/srv/atomaste-dev`