removing file, fixing xrefs

Author: batamig

articles/defender-for-iot/organizations/appliance-catalog/appliance-catalog-overview.md

@@ -63,4 +63,4 @@ Then, use any of the following procedures to continue:
 - [Download software for an on-premises management console](how-to-manage-the-on-premises-management-console.md#download-software-for-the-on-premises-management-console)
 - [Install software](how-to-install-software.md)
 
-Our OT monitoring appliance reference articles also include extra installation procedures in case you need to install software on your own appliances, or reinstall software on preconfigured appliances. For more information, see [OT monitoring appliance reference](appliance-catalog/appliance-catalog-overview.md).
+Our OT monitoring appliance reference articles also include extra installation procedures in case you need to install software on your own appliances, or reinstall software on preconfigured appliances. For more information, see [OT monitoring appliance reference](appliance-catalog/appliance-catalog-overview.yml).