universeair: prepare for emacs tree-sitter

machines/universeair/configuration.nix

@@ -40,6 +40,12 @@ in
           };
         };
         home.stateVersion = "22.05";
+        # TODO: https://nohzafk.github.io/posts/2023-12-18-nix-emacs-treesit-grammars/
+        # home.file = {
+        #   # tree-sitter subdirectory of the directory specified by user-emacs-directory
+        #   ".config/emacs/.local/cache/tree-sitter".source =
+        #     "${emacs29.treesitGrammars}/lib";
+        # };
       };
     };