Add howto in card

Author: adegeo

docs/navigate/migration-guide/index.yml

@@ -19,6 +19,10 @@ landingContent:
             url: ../../core/porting/github-copilot-app-modernization-overview.md
           - text: FAQ
             url: ../../core/porting/github-copilot-app-modernization-faq.yml
+      - linkListType: how-to-guide
+        links:
+          - text: How to upgrade a .NET app
+            url: ../../core/porting/how-to-upgrade-with-github-copilot.md
 
   - title: Migrate .NET apps to Azure
     linkLists: