simplify serve

Author: willmcgugan

.gitignore

@@ -2,7 +2,7 @@
 __pycache__/
 *.py[cod]
 *$py.class
-
+.vscode/
 # C extensions
 *.so
 

src/textual_dev/cli.py

@@ -257,6 +257,9 @@ def serve(
     """
     from textual_serve.server import Server
 
+    if " " not in command and command.endswith(".py"):
+        command = f"python {command}"
+
     server = Server(command, host, port, title=title, public_url=url)
     server.serve(debug=dev)