nolonger override shell with nixpkgs and blank overlays

.gitignore

@@ -5,3 +5,4 @@ result*
 .direnv
 .kube
 .github
+.profile

shell.nix

@@ -1,17 +1,5 @@
 # Shell for bootstrapping flake-enabled nix and home-manager
-{ pkgs ? let
-    # If pkgs is not defined, instantiate nixpkgs from locked commit
-    lock = (builtins.fromJSON (builtins.readFile ./flake.lock)).nodes.nixpkgs.locked;
-    nixpkgs = fetchTarball {
-      url = "https://github.com/nixos/nixpkgs/archive/${lock.rev}.tar.gz";
-      sha256 = lock.narHash;
-    };
-    system = builtins.currentSystem;
-    overlays = [ ]; # Explicit blank overlay to avoid interference
-  in
-  import nixpkgs { inherit system overlays; }
-, ...
-}:
+{ pkgs ? import <nixpkgs> {} }:
 pkgs.mkShell {
   # Enable experimental features without having to specify the argument
   NIX_CONFIG = "experimental-features = nix-command flakes";