(Azure CXP) remove duplicate leftnav entry

resolves MicrosoftDocs/azure-docs#54164

Author: mikeurnun

articles/api-management/TOC.yml

@@ -228,8 +228,6 @@
               href: how-to-configure-cloud-metrics-logs.md
             - name: Configure local metrics and logs for self-hosted gateway
               href: how-to-configure-local-metrics-logs.md
-            - name: Log requests with Azure Application Insights
-              href: api-management-howto-app-insights.md
             - name: Set up DR using backup/restore
               href: api-management-howto-disaster-recovery-backup-restore.md
             - name: Manage user accounts