docs: add a note about Vue Teleports in routing section

Author: notwindstone

docs/PLAN.md

@@ -54,7 +54,11 @@ const router = useRouterStore();
 </template>
 ```
 
-simple ass
+simple ass.
+
+and!! to make custom layouts even easier to do, we can use a <Teleport /> for each page
+
+plugins will change some state for <Teleport /> to mount a page component on the page change to somewhere
 </details>
 
 ## Extensions