docs(blog): added blog post explaining operatorless istio changes

General MR

Summary

This MR adds a blog post explaining the incoming istio changes for Big Bang 3.0.

Linked Issue

Closes #2561 (closed)

Upgrade Notices

N/A

blog/bb-3-0-operatorless-istio-migration.md

@@ -68,8 +68,8 @@ Here are some key architectural changes you should be aware of:
 ✅ **Simplified Deployment with Iterable Helm Releases**
 
 - We are developing an iterable `istioGateway` package to ease deployment.
-- Users can still deploy custom `Gateway`s manually, but our new package will
-  reduce friction.
+- Users can still deploy custom `Gateway` resources manually, but our new package
+  will reduce friction.
 - More details on this feature will be shared in the coming weeks.
 
 🔍 **Exploring Kubernetes-native Gateway API**