Fix greeting delay slider not appearing in web interface

- Delete old templates directory to force regeneration
- Templates are auto-generated on first run only
- Add note to README about regenerating templates
- Solution: Delete templates/ and restart script to get new features

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

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

README.md

@@ -221,6 +221,8 @@ wedding-phone/
     └── index.html            # Web interface (embedded in script)
 ```
 
+**Note:** The `templates/index.html` file is automatically generated when you first run `rotary_phone_web.py`. If you update the script and want to regenerate the template with new features, simply delete the `templates` directory and restart the script.
+
 ### Runtime Data (Auto-created)
 
 ```