remove TOC entry

Author: rboucher

articles/azure-monitor/toc.yml

@@ -133,8 +133,6 @@ items:
     href: azure-cli-metrics-alert-sample.md
 - name: Concepts
   items:
-  - name: Continuous monitoring
-    href: continuous-monitoring.md
   - name: Observability
     href: observability-data.md
   - name: Data platform