refactor: update flake file and install home-manager in standalone mode

flake.nix

@@ -16,13 +16,16 @@
 
   };
 
-  outputs = { self, nixpkgs, home-manager, ... }@inputs: {
-
-    # nixos system config
-    nixosConfigurations.default = nixpkgs.lib.nixosSystem {
+  outputs = { self, nixpkgs, home-manager, ... }:
+    let
+      lib = nixpkgs.lib;
       system = "x86_64-linux";
-      specialArgs = {inherit inputs;};
-
+      pkgs = nixpkgs.legacyPackages.${system};
+    in {
+    # nixos system config
+    nixosConfigurations = {
+      default = nixpkgs.lib.nixosSystem {
+        inherit system;
         modules = [
           # import host specific configs
           ./hosts/default/configuration.nix
@@ -31,5 +34,12 @@
         ];
       };
     };
-
+    # home-manager config
+    homeConfigurations = {
+      aaron = home-manager.lib.homeManagerConfiguration {
+        inherit pkgs;
+        modules = [ ./hosts/default/home.nix ];
+      };
+    };   
+  };
 }