chore(package.json): add missing module type

docs/package.json

@@ -1,6 +1,7 @@
 {
   "name": "@nuxt/ui-docs",
   "private": true,
+  "type": "module",
   "dependencies": {
     "@nuxt/ui": "workspace:latest"
   },

package.json

@@ -3,6 +3,7 @@
   "version": "2.13.0",
   "repository": "nuxt/ui",
   "homepage": "https://ui.nuxt.com",
+  "type": "module",
   "license": "MIT",
   "exports": {
     ".": {