Add config option to make terminal the default

modules/home/wezterm/default.nix

@@ -25,6 +25,7 @@ in
 {
   options.modules.wezterm = {
     enable = lib.mkOption { default = false; };
+    mkDefault = lib.mkOption { default = true; };
   };
 
   config = lib.mkIf cfg.enable {
@@ -35,7 +36,7 @@ in
         local config = {}
 
         config.color_scheme = 'Catppuccin Mocha'
-        -- config.font = wezterm.font 'DejaVu Sans'
+        -- config.font = wezterm.font 'JetBrains Mono'
         -- config.font_size = 12.0
         config.hide_tab_bar_if_only_one_tab = true
         config.audible_bell = 'Disabled'
@@ -47,7 +48,7 @@ in
       '';
     };
 
-    home.sessionVariables.TERMINAL = "wezterm-start-here";
+    home.sessionVariables.TERMINAL = lib.mkIf cfg.mkDefault "wezterm-start-here";
 
     # Otherwise wezterm does not start in directory of parent process
     home.packages = [