removed file and added a redirection

Author: spelluru

articles/azure-relay/.openpublishing.redirection.relay.json

@@ -5,6 +5,11 @@
     "redirect_url": "/azure/service-bus-messaging/security-baseline",
     "redirect_document_id": false
   },
+  {
+    "source_path_from_root": "/articles/azure-relay/relay-migrate-acs-sas.md",
+    "redirect_url": "/azure/azure-relay/relay-authentication-and-authorization",
+    "redirect_document_id": false
+  },
   {
     "source_path_from_root": "/articles/service-bus-relay/diagnostic-logs.md",
     "redirect_url": "/azure/azure-relay/diagnostic-logs",

articles/azure-relay/TOC.yml

@@ -56,10 +56,6 @@
     href: move-across-regions.md
   - name: Migrate from Azure Service Manager (classic) APIs to Resource Manager APIs
     href: ../service-bus-messaging/deprecate-service-bus-management.md?toc=%2fazure%2fservice-bus-relay%2ftoc.json    
-  - name: Plan and design
-    items:
-    - name: Migrate from ACS to SAS
-      href: relay-migrate-acs-sas.md
   - name: Develop
     items:
     - name: Create a namespace