all application options will adapt to environment

when used either with nixos (no home-manager) or home-manager standalone, `features.applications.<name>.enable` options still perform some functionality, rather than assuming a full nixos + home-manager setup like before

modules/features/applications/gui/nautilus.nix

@@ -17,11 +17,9 @@
         terminal = "kitty";
       };
 
-      home-manager.sharedModules = [
-        {
-          features.applications.gui.nautilus.enable = true;
-        }
-      ];
+      home-manager.users.grey = lib.mkIf (config.features.nixos.home-manager.enable) {
+        features.applications.gui.nautilus.enable = true;
+      };
     };
   };
 
@@ -29,6 +27,8 @@
     options.features.applications.gui.nautilus.enable = lib.mkEnableOption "nautilus";
 
     config = lib.mkIf (config.features.applications.gui.nautilus.enable) {
+      home.packages = lib.mkIf (config.info.isStandalone) [ pkgs.nautilus ];
+
       gtk.gtk3.bookmarks = [
         "file://${config.info.rootPath} NixOS"
         "file:///home/grey/Downloads Downloads"