Replace hacky 'call-out-to-shell' with an actual API call

Might possibly have a shot at, if nothing else, helping us get a little closer to finding the cause of #2.

app.py

@@ -183,7 +183,7 @@ def ship(request,ship=None):
                 author = f.readline().strip()
             yield f"=> /{urlencoded}/AUTHOR © {year} {author}\n"
         else:
-            username = (subprocess.run(["/usr/bin/stat","-c","%U",os.path.join("/var/gopher",ship_unquoted)],stdout=subprocess.PIPE).stdout or b"unknown").decode("utf-8").strip()
+            username = (Path("/var/gopher") / ship_unquoted).owner()
             yield f"© {year} {username}\n"
         license_file = os.path.join("/var/gopher",ship_unquoted,"LICENSE")
         if os.path.exists(license_file):