docs: add NGINXaaS landing card (#1299)

Author: JTorreG

content/_index.md

@@ -46,4 +46,7 @@ Learn how to deliver, manage, and protect your applications using F5 NGINX produ
   {{<card title="F5 NGINXaaS for Azure" titleUrl="/nginxaas/azure/" brandIcon="F5-NGINXaaS-icon.svg" isLanding="true">}}
     Infrastructure-as-a-Service (IaaS) version of NGINX Plus for your Microsoft Azure application stack.
   {{</card >}}
+  {{<card title="F5 NGINXaaS for Google Cloud" titleUrl="/nginxaas/google/" brandIcon="F5-NGINXaaS-icon.svg" isLanding="true">}}
+    Managed NGINX service for your Google Cloud application stack.
+  {{</card >}}
 {{</card-section>}}