realised how self' is supposed to work and removed all stdenv bullshit

modules/features/zsh/default.nix

@@ -1,16 +1,17 @@
 {
   self,
   inputs,
+  moduleWithSystem,
   ...
 }: {
-  flake.nixosModules.zsh = {
+  flake.nixosModules.zsh = moduleWithSystem ({
     pkgs,
-    lib,
+    self',
     ...
   }: {
     nixpkgs.overlays = [
       (final: prev: {
-        zsh = self.packages.${pkgs.stdenv.hostPlatform.system}.zsh;
+        zsh = self'.packages.zsh;
       })
     ];
     programs.zsh = {
@@ -22,7 +23,7 @@
       histSize = 10000;
     };
     users.defaultUserShell = pkgs.zsh;
-  };
+  });
   perSystem = {
     pkgs,
     lib,
@@ -54,7 +55,7 @@
           export EDITOR=nvim
 
           eval "$(${lib.getExe pkgs.devenv} hook zsh)"
-          eval "$(${lib.getExe self.packages.${pkgs.host.stdenv.hostPlatform.system}.ohMyPosh} init zsh)"
+          eval "$(${lib.getExe self'.packages.ohMyPosh} init zsh)"
 
           ${lib.getExe pkgs.any-nix-shell} zsh --info-right | source /dev/stdin
         '';