fix: correct flake configuration and remove duplicate home-manager setup

- Update flake.nix with correct hostname (nixos) and username (l-wyatt)
- Remove channel-based home-manager imports from configuration.nix
- Eliminate duplicate home-manager.users configuration
- Ensures flake-based home-manager works properly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

flake.nix

@@ -30,7 +30,7 @@
 
   outputs = { self, nixpkgs, home-manager, ... }: {
     nixosConfigurations = {
-      yourhostname = nixpkgs.lib.nixosSystem {
+      nixos = nixpkgs.lib.nixosSystem {
         system = "x86_64-linux";
         modules = [
           ./configuration.nix
@@ -38,7 +38,7 @@
           {
             home-manager.useGlobalPkgs = true;
             home-manager.useUserPackages = true;
-            home-manager.users.yourusername = import ./home.nix;
+            home-manager.users.l-wyatt = import ./home.nix;
           }
         ];
       };