Update intro/powersync-overview.mdx

Author: cahofmeyr

intro/powersync-overview.mdx

@@ -140,7 +140,7 @@ Explore and learn from example implementations and common use cases with PowerSy
 
 ## Learn More about PowerSync
 
-<CardGroup cols={3}>
+<CardGroup cols={2}>
   <Card title="Architecture" icon="database" href="/architecture/architecture-overview">
     Understand the architecture of the various PowerSync components and how consistency is ensured.
   </Card>