use retro tab bar and remove just completions in favor of generic nix zsh completions

setup-mac.sh

@@ -138,6 +138,7 @@ config.color_scheme = 'One Light (base16)'
 config.window_background_opacity = 0.9
 config.initial_rows = 30
 config.initial_cols = 120
+config.use_fancy_tab_bar = false
 
 return config
 EOF
@@ -236,7 +237,6 @@ AUTO_FILE="$HOME/.zshrc.auto"
 echo > "$AUTO_FILE"
 atuin init zsh >> "$AUTO_FILE"
 direnv hook zsh >> "$AUTO_FILE"
-#just --completions zsh >> "$AUTO_FILE"
 starship init zsh --print-full-init >> "$AUTO_FILE"
 zoxide init zsh >> "$AUTO_FILE"