[update] Viewing IoT Data with ThingsBoard (#7186)

added deprecated

Author: Rajakavitha1

docs/guides/development/iot/install-thingsboard-iot-dashboard/index.md

@@ -14,6 +14,7 @@ external_resources:
   - '[ThingsBoard Github Repo](https://github.com/thingsboard/thingsboard)'
 audiences: ["intermediate"]
 aliases: ['/development/iot/install-thingsboard-iot-dashboard/']
+deprecated: true
 ---
 
 ![View IoT Data with ThingsBoard](ThingsBoard.jpg)