Update image size

Author: fwang

README.md

@@ -58,7 +58,7 @@ OpenNext does not create the underlying infrastructure. You can create the infra
 This is the recommended setup.
 
 <p align="center">
-  <img alt="Architecture" src="/readme/architecture.png" width="600" />
+  <img alt="Architecture" src="/readme/architecture.png" width="800" />
 </p>
 
 A few AWS resources are created: