fix(iot): fix quickstart link on landing (#5104)

Author: bene2k1

pages/iot-hub/index.mdx

@@ -8,7 +8,7 @@ meta:
    productName="IoT Hub"
    productLogo="iotHub"
    description="IoT Hub allows to connect and manage thousands of IoT devices effortlessly using the most popular protocols (MQTT, Sigfox, LoRaWAN, REST, and Websockets)."
-   url="/iot-hub/concepts/"
+   url="/iot-hub/quickstart/"
    label="IoT Hub Quickstart"
 />