Add Serena project configuration and update website files

- Configure Serena AI coding assistant with TypeScript language support
- Update gitignore patterns and website content
- Enhance professional theme JavaScript functionality
- Update multiple pages across menu and ROA sections

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

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

.gitignore

@@ -5,4 +5,5 @@ efactura-generator/config.json
 efactura-generator/php.ini
 Thumbs.db
 *.zip
-.svn
+.svn
+.serena/cache/