Failover Cluster Notebook added (#14004)

* wip failover notebook

* notebook instructions changed

* added failover cluster notebook to toc and readme

* Failover Cluster cell added

* Added VMs to the cluster cell

* More changes made

* Offers added

* SqlVm Names added

* added secure passwords for account passwords

* wip parameters added for configure failover notebook

* updated storage account creation

* added offer and fixed resource group names

* added missing ` and boolean value

* added prerequisites for configure-failover notebook

* removed unnecessary ip address message

* Added secure string for storage account key

* changed name of storage account key variable.

* Changed resource group name parameter

* removed space

* changed sql version to match tutorial

* Added message about image SKU

* Changes made to failover cluster notebook (Working)

* added wait warning

* failover cluster notebook added with variable table

* readme is now divided into two sections

* simplified HADR

extensions/azurehybridtoolkit/notebooks/hybridbook/_data/toc.yml

@@ -64,6 +64,8 @@
   sections:
   - title: Backup Database to Blob Storage
     url: hadr/backup-to-blob
+  - title: Create Failover Cluster
+    url: hadr/configure-failover
 - title: Offline Migration
   url: /offline-migration/readme
   not_numbered: true