add basic new syntax

packages/vue-starter-kit/index.ts

@@ -1,8 +1,16 @@
 // import originalDefaultExtensions from '@tiptap/starter-kit'
 
+import Document from '@tiptap/extension-document'
+import Text from '@tiptap/extension-text'
+import Paragraph from '@tiptap/extension-paragraph'
+
 export * from '@tiptap/vue'
 
 export function defaultExtensions() {
-  return []
+  return [
+    Document(),
+    Text(),
+    Paragraph(),
+  ]
   // return originalDefaultExtensions()
 }