Move all under Concepts

Author: ggailey777

articles/azure-functions/TOC.yml

@@ -242,8 +242,14 @@
           displayName: secure, ssl
         - name: Security baseline
           href: /security/benchmark/azure/baselines/functions-security-baseline?toc=/azure/azure-functions/TOC.json
-    - name: Reliability 
-      href: ../reliability/reliability-functions.md?toc=/azure/azure-functions/TOC.json
+    - name: Reliability
+      items:
+        - name: Availability zones 
+          href: ../reliability/reliability-functions.md?toc=/azure/azure-functions/TOC.json
+        - name: Migrate to a zone-redundant plan
+          href: ../reliability/migrate-functions.md?toc=%2fazure%2fazure-functions%2ftoc.json
+        - name: Geo-disaster recovery
+          href: functions-geo-disaster-recovery.md  
     - name: Monitor function executions
       href: functions-monitoring.md
       displayName: App Insights, Application Insights, logs, logging
@@ -419,12 +425,6 @@
           href: configure-networking-how-to.md
         - name: Move across regions
           href: functions-move-across-regions.md
-        - name: Reliability
-          items:
-            - name: Migrate to a zone-redundant plan
-              href: ../reliability/migrate-functions.md?toc=%2fazure%2fazure-functions%2ftoc.json
-            - name: Geo-disaster recovery
-              href: functions-geo-disaster-recovery.md  
         - name: Work with legacy Functions Proxies
           href: legacy-proxies.md  
     - name: Migrate