Docs: changed icon

Author: mudgen

website/docs/intro.mdx

@@ -95,7 +95,7 @@ Our smart contract library is perfect for:
   <DocCard
     title="Compose Design"
     description="Learn how Compose is designed."
-    icon={<Icon name="rocket" size={28} />}
+    icon={<Icon name="diamond" size={28} />}
     href="/docs/design"
     size="large"
   />