remove old commented out code (pixiecore, utils, xenia kernel)

modules/utils.nix

@@ -1,56 +0,0 @@
-{
-  pkgs,
-  lib,
-}: rec {
-  # taken from https://github.com/NixOS/nixpkgs/blob/3650808d85dccbfa3be3d785dfd3ce33a757bd2c/pkgs/build-support/trivial-builders/default.nix#L335
-  writeNuShellApplication = {
-    name,
-    text,
-    runtimeInputs ? [],
-    meta ? {},
-    checkPhase ? null,
-  }:
-    writeTextFile {
-      inherit name meta;
-      executable = true;
-      destination = "/bin/${name}";
-      allowSubstitutes = true;
-      preferLocalBuild = false;
-      text =
-        ''
-          #!${pkgs.nushell}
-        ''
-        + lib.optionalString (runtimeInputs != []) ''
-
-          $env.PATH = ($env.PATH | split row (char esep) | prepend '${lib.makeBinPath runtimeInputs}');
-        ''
-        + ''
-
-          ${text}
-        '';
-
-      checkPhase =
-        # GHC (=> shellcheck) isn't supported on some platforms (such as risc-v)
-        # but we still want to use writeShellApplication on those platforms
-        if checkPhase == null
-        then ''
-          runHook preCheck
-
-          nu -c "nu-check -d $target"
-
-          runHook postCheck
-        ''
-        else checkPhase;
-    };
-  packageNushellApplication = {
-    name,
-    path,
-    runtimeInputs ? [],
-    meta ? {},
-    checkPhase ? null,
-  }:
-    writeNuShellApplication {
-      inherit name runtimeInputs meta checkPhase;
-      text = builtins.readFile path;
-    };
-}