add back old module for compatibility

clanModules/admin/default.nix

@@ -1,12 +1,3 @@
-{ config, ... }:
 {
-  config.assertions = [
-    {
-      assertion = config.clan.inventory.services.admin != { };
-      message = ''
-        The admin module has been migrated from `clan.services` to `clan.instances`
-        See https://docs.clan.lol/TODO for updated usage.
-      '';
-    }
-  ];
+  imports = [ ./roles/default.nix ];
 }