ma state.mod: put activation logic into module

3modules/state.nix

@@ -6,4 +6,11 @@
     description = "state which is currently scattered on the machine";
     default = [];
   };
+
+  config.system.activationScripts.state =  lib.optionalString (config.state != []) ''
+    cat << EOF
+    This machine is burdened with state:
+    ${lib.concatMapStringsSep "\n" (d: "* ${d}") config.state}
+    EOF
+  '';
 }