link update

Author: pingfan-hu

templates/option_shuffling.qmd

@@ -26,5 +26,5 @@ Refer to the [Start with a template](/docs/getting-started.html#start-with-a-tem
 :::
 
 <div class="template-iframe-container">
-<iframe src="https://surveydown.shinyapps4.io/option_shuffling/" class="template-iframe"></iframe>
+<iframe src="https://surveydown4.shinyapps.io/option_shuffling/" class="template-iframe"></iframe>
 </div>