feat: add zsh as default shell

users/modules/programs/zsh.nix

@@ -0,0 +1,8 @@
+{
+  programs.zsh = {
+    enable = true;
+    enableCompletion = true;
+    enableVteIntegration = true;
+    # TODO: Look into whether we need to add the history attribute
+  };
+}

users/modules/sh.nix

@@ -1,7 +1,6 @@
 # Default shell utilities and programs
 {
   imports = [
-    ./programs/bash.nix
     ./programs/btop.nix
     ./programs/direnv.nix
     ./programs/fzf.nix
@@ -11,6 +10,7 @@
     ./programs/tealdeer.nix
     ./programs/tmux.nix
     ./programs/yazi.nix
+    ./programs/zsh.nix
     ./scripts
   ];
 }