fix: Add missing imports to migrate_existing_website.py

- Added argparse, json, shutil, re, subprocess imports
- Fixed NameError when running script
- Script now works correctly

skills/website-creator/scripts/migrate_existing_website.py

@@ -33,6 +33,15 @@ import json
 import shutil
 import re
 import subprocess
+import argparse
+from pathlib import Path
+from datetime import datetime
+from typing import Dict, List, Any, Optional
+import sys
+import json
+import shutil
+import re
+import subprocess
 from pathlib import Path
 from datetime import datetime
 from typing import Dict, List, Any, Optional