fix(nix): add reference to flake and fix name

flake.nix

@@ -4,10 +4,14 @@
   outputs = { self, ... }:
   {
     templates = {
-      devenv-uv = {
+      devenv-uv   = {
         path = ./nix/template.d/devenv-uv;
         description = "devenv template with uv";
       };
+      devenv-node = {
+        path = ./nix/template.d/devenv-node;
+        description = "devenv template with node and pnpm";
+      };
     };
   };
 }