feat: Rename product title for NGINX as a Service (#1095)

Rename product title for NGINX as a Service

NGINX as a Service >> NGINXaaS

Author: JTorreG

data/product-selector.yaml

@@ -25,5 +25,5 @@
 
 - productGroup: NGINX as a Service
   products:
-    - title: "NGINX as a Service for Azure"
+    - title: "NGINXaaS for Azure"
       url: "nginxaas/azure/"