chore: Embed demo for rolling back a Flutter app patch (#468)

* chore: Embed demo for rolling back a Flutter app patch

Added an iframe for embedding a demo related to rolling back a patch for a Flutter app release.

* adding the wrapping div to style it correctly

---------

Co-authored-by: Tom Arra <tarra3@gmail.com>

Author: dawn-ducky

src/content/docs/code-push/rollback.mdx

@@ -17,6 +17,20 @@ Roll back requires a minimum Flutter version of 3.27.4
 
 :::
 
+<div style="position: relative; padding-bottom: calc(56.25% + 41px); height: 0px; width: 100%;">
+  <iframe
+    src="https://demo.arcade.software/s8679FzLXoq93HxB05nj?embed&embed_mobile=tab&embed_desktop=inline&show_copy_link=true"
+    title="Roll Back a Patch for a Flutter App Release"
+    frameborder="0"
+    loading="lazy"
+    webkitallowfullscreen
+    mozallowfullscreen
+    allowfullscreen
+    allow="clipboard-write"
+    style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; color-scheme: light;"
+  ></iframe>
+</div>
+
 ## How to roll back a patch
 
 In the [Shorebird Console](https://console.shorebird.dev/), navigate to the