remove old workload migration document

Author: anaharris-ms

articles/reliability/TOC.yml

@@ -401,8 +401,6 @@
         href: migrate-storage.md
       - name: Azure Virtual Machines and Virtual Machine Scale Sets
         href: migrate-vm.md
-      - name: Workload - Azure Kubernetes and MySQL
-        href: migrate-workload-aks-mysql.md
 - name: Reliability concepts
   items:
   - name: Business continuity, high availability, and disaster recovery