change some niri config, add setup script for nobara on PC

modules/features/shells/zsh.nix

@@ -8,8 +8,6 @@
 
   flake.nixosModules.global = { config, pkgs, lib, ... }: {
     config = lib.mkIf (config.features.shells.zsh.enable || config.features.shells.defaultShell == "zsh") {
-      programs.zsh.enable = true;
-
       home-manager.users.${config.info.userName} = lib.mkIf (config.features.nixos.home-manager.enable) {
         features.shells.zsh.enable = lib.mkDefault true;
         features.shells.zsh.antidote.enable = lib.mkDefault config.features.shells.zsh.antidote.enable;