feat: Use wide grid for main ngf diagram (#1197)

Author: nginx-jack

content/ngf/overview/gateway-architecture.md

@@ -55,7 +55,7 @@ Users can have multiple gateways running side-by-side in the same cluster. This
 
 This figure depicts an example of NGINX Gateway Fabric exposing three web applications within a Kubernetes cluster to clients on the internet:
 
-```mermaid
+```mermaid {grid="wide"}
 graph LR
     %% Nodes and Relationships
     subgraph KubernetesCluster["Kubernetes Cluster"]