added demo video (#21461)

Author: aninibread

src/content/docs/autorag/index.mdx

@@ -36,9 +36,14 @@ You can use AutoRAG to build:
 
 <div>
 	<LinkButton href="/autorag/get-started">Get started</LinkButton>
-	{/* <LinkButton target="_blank" variant="secondary" icon="external" href="">
-		Watch an AutoRAG demo
-	</LinkButton> */}
+	<LinkButton
+		target="_blank"
+		variant="secondary"
+		icon="external"
+		href="https://www.youtube.com/watch?v=JUFdbkiDN2U"
+	>
+		Watch AutoRAG demo
+	</LinkButton>
 </div>
 
 ---