Update Azure Deploy Button (#28150)

The focus of these changes is to update to the new Azure Deploy button image.

samples/iothub-connect-to-eventhubs/README.md

@@ -28,12 +28,12 @@ This sample illustrates querying the IoT Hub service to obtain the connection st
 
 To quickly create the needed IoT Hub resource in Azure and to receive a connection string for it, you can deploy our sample template by clicking:
 
-[![](http://azuredeploy.net/deploybutton.png)](https://portal.azure.com/#create/Microsoft.Template/uri/https%3A%2F%2Fgithub.com%2FAzure%2Fazure-sdk-for-net%2Ftree%2Fmaster%2Fsamples%2F%2Fiothub-connect-to-eventhubs%2Fsample-resources.json)
+[![Deploy to Azure](https://aka.ms/deploytoazurebutton)](https://portal.azure.com/#create/Microsoft.Template/uri/https%3A%2F%2Fgithub.com%2FAzure%2Fazure-sdk-for-net%2Ftree%2Fmaster%2Fsamples%2F%2Fiothub-connect-to-eventhubs%2Fsample-resources.json)
 
 ## References
 
 - [What is Azure IoT Hub?](https://docs.microsoft.com/azure/iot-hub/about-iot-hub)
 - [IoT Hub - Endpoints documentation](https://docs.microsoft.com/azure/iot-hub/iot-hub-devguide-endpoints)
 - [IoT Hub - Read device-to-cloud messages from the built-in endpoint](https://docs.microsoft.com/azure/iot-hub/iot-hub-devguide-messages-read-builtin)
 
-![Impressions](https://azure-sdk-impressions.azurewebsites.net/api/impressions/azure-sdk-for-net%2Fsamples%2F%2Fiothub-connect-to-eventhubs%2FREADME.png)
+![Impressions](https://azure-sdk-impressions.azurewebsites.net/api/impressions/azure-sdk-for-net%2Fsamples%2F%2Fiothub-connect-to-eventhubs%2FREADME.png)