Remove temp file

Author: adegeo

docs/navigate/migration-guide/toc.yml

@@ -14,8 +14,6 @@ items:
       - name: GitHub Copilot app modernization FAQ
         href: ../../core/porting/github-copilot-app-modernization-faq.yml
         displayName: copilot, upgrade, faq
-      - name: Update .NET SDK and Runtime
-        href: ../../core/porting/github-copilot-app-modernization-faq.yml
       - name: Planning your .NET Framework upgrade
         items:
           - name: Overview