Remove Sphere reference

Author: dominicbetts

articles/iot-central/.openpublishing.redirection.iot-central.json

@@ -1387,7 +1387,7 @@
     },
     {
       "source_path_from_root": "/articles/iot-central/core/troubleshoot-connection.md",
-      "redirect_url": "/azure/iot-central/core/troubleshooting/",
+      "redirect_url": "/azure/iot-central/core/troubleshooting",
       "redirect_document_id": true
     }
   ]

articles/iot-central/TOC.yml

@@ -132,8 +132,6 @@
           href: core/howto-manage-deployment-manifests.md
         - name: Connect devices through an IoT Edge transparent gateway
           href: core/how-to-connect-iot-edge-transparent-gateway.md
-        - name: Prepare and connect an Azure Sphere DevKit
-          href: /azure-sphere/app-development/setup-iot-central
         - name: Prepare and connect a RuuviTag device
           href: core/howto-connect-ruuvi.md
         - name: Prepare and connect a Rigado Cascade 500