docs: update content

docs/src/demos/Overview/Installation/index.vue

@@ -4,7 +4,7 @@
 
 <script>
 import { Editor, EditorContent } from '@tiptap/vue-2'
-import { defaultExtensions } from '@tiptap/starter-kit'
+import StarterKit from '@tiptap/starter-kit'
 
 export default {
   components: {
@@ -20,7 +20,9 @@ export default {
   mounted() {
     this.editor = new Editor({
       content: '<p>Hello World! 🌎️</p>',
-      extensions: defaultExtensions(),
+      extensions: [
+        StarterKit,
+      ],
     })
   },