mv update command to machines update command

pkgs/clan-cli/clan_cli/machines/__init__.py

@@ -0,0 +1,17 @@
+# !/usr/bin/env python3
+import argparse
+
+from .update import register_update_parser
+
+
+# takes a (sub)parser and configures it
+def register_parser(parser: argparse.ArgumentParser) -> None:
+    subparser = parser.add_subparsers(
+        title="command",
+        description="the command to run",
+        help="the command to run",
+        required=True,
+    )
+
+    groups_parser = subparser.add_parser("update", help="Update a machine")
+    register_update_parser(groups_parser)