feat(storefront): update FAQ and legal documentation

- Added new FAQ sections for account security, ordering and checkout, returns, shipping, and contact information.
- Introduced legal documents including privacy policy, terms of service, data protection, and general terms and conditions.
- Updated package dependencies to include gray-matter and remark-gfm for enhanced markdown support.

apps/storefront/package.json

@@ -19,7 +19,9 @@
     "@stripe/react-stripe-js": "^5.6.0",
     "@stripe/stripe-js": "^8.8.0",
     "framer-motion": "^11.0.0",
+    "gray-matter": "^4.0.3",
     "lucide-react": "^0.400.0",
-    "react-markdown": "^10.1.0"
+    "react-markdown": "^10.1.0",
+    "remark-gfm": "^4.0.0"
   }
 }