misc improvements to modularity

modules/features/nixos/home-manager.nix

@@ -20,7 +20,7 @@
         inherit inputs;
       };
 
-      users.grey = self.homeModules.${config.info.hostName};
+      users.${config.info.userName} = self.homeModules."${config.info.userName}@${config.info.hostName}";
     };
   };
 }

modules/features/nixos/stylix.nix

@@ -13,7 +13,7 @@
       stylix.image = builtins.path { path = "${self}/modules/hosts/${config.info.hostName}/wallpaper.jpg"; };
       stylix.polarity = "dark";
 
-      home-manager.users.grey = lib.mkIf (config.features.nixos.home-manager.enable) {
+      home-manager.users.${config.info.userName} = lib.mkIf (config.features.nixos.home-manager.enable) {
         features.nixos.stylix.enable = lib.mkDefault config.features.nixos.stylix.enable;
       };
     };