restructured and optimized content

overlays/default.nix

@@ -25,6 +25,13 @@
     };
   };
 
+  home-manager-unstable = final: _prev: {
+    hunstable = import inputs.home-manager-unstable {
+      system = final.system;
+      config.allowUnfree = true;
+    };
+  };
+
   nur-packages = final: _prev: {
     nur = import inputs.nur {
       nurpkgs = final;