Repurpose what's new as migration guide

.openpublishing.redirection.orleans.json

@@ -7,6 +7,10 @@
         {
             "source_path_from_root": "/docs/orleans/deployment/azure-web-apps-with-azure-cloud-services.md",
             "redirect_url": "/dotnet/orleans/deployment/deploy-to-azure-app-service"
+        },
+        {
+            "source_path_from_root": "/docs/orleans/whats-new-in-orleans.md",
+            "redirect_url": "/dotnet/orleans/migration-guide"
         }
     ]
 }

docs/core/whats-new/dotnet-7.md

@@ -167,7 +167,7 @@ WPF in .NET 7 includes numerous bug fixes as well as performance and accessibili
 
 ### Orleans
 
-Orleans is a cross-platform framework for building robust, scalable distributed applications. For information about the latest updates for Orleans, see [What's new in Orleans 7.0](../../orleans/whats-new-in-orleans.md).
+Orleans is a cross-platform framework for building robust, scalable distributed applications. For information about the latest updates for Orleans, see [Migrate from Orleans 3.x to 7.0](../../orleans/migration-guide.md).
 
 ### .NET Upgrade Assistant and CoreWCF
 

docs/orleans/index.yml

@@ -9,7 +9,7 @@ metadata:
     description: Samples, tutorials, and education for .NET Orleans. Microsoft's cloud native and distributed systems platform.
     ms.topic: hub-page
     ms.prod: dotnet-orleans
-    ms.date: 02/22/2023
+    ms.date: 03/06/2023
 
 highlightedContent:
     # itemType: architecture | concept | deploy | download | get-started | how-to-guide | learn | overview | quickstart | reference | tutorial | whats-new
@@ -21,8 +21,8 @@ highlightedContent:
           title: Deploy Orleans apps
           url: deployment/index.md
         - itemType: whats-new
-          title: What's new in Orleans
-          url: whats-new-in-orleans.md
+          title: "Migrate from Orleans 3.x to 7.0"
+          url: migration-guide.md
         - itemType: concept
           title: Why Orleans?
           url: benefits.md