Set default terminal

user-modules/terminal/default.nix

@@ -9,6 +9,9 @@ with lib;
 {
   options.default.terminal = mkOption {
     type = types.str;
+    # TODO: Make sure everything works even without a default value here
+    # Maybe make sure most gui applications do not exist in the default specialisation
+    default = "foot";
     description = "Default terminal application";
   };
 }