Update README.md

Author: jason-fox

README.md

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 [![FIWARE Banner](https://fiware.github.io/tutorials.IoT-Agent-JSON/img/fiware.png)](https://www.fiware.org/developers)
-[![NGSI v2](https://img.shields.io/badge/NGSI-v2-5dc0cf.svg)](https://fiware-ges.github.io/orion/api/v2/stable/)
 
 [![FIWARE IoT Agents](https://nexus.lab.fiware.org/repository/raw/public/badges/chapters/iot-agents.svg)](https://github.com/FIWARE/catalogue/blob/master/iot-agents/README.md)
 [![License: MIT](https://img.shields.io/github/license/fiware/tutorials.IoT-Agent.svg)](https://opensource.org/licenses/MIT)
 [![Support badge](https://img.shields.io/badge/tag-fiware-orange.svg?logo=stackoverflow)](https://stackoverflow.com/questions/tagged/fiware)
 [![JSON](https://img.shields.io/badge/Payload-JSON-f06f38.svg)](https://fiware-iotagent-json.readthedocs.io/en/latest/usermanual/index.html#user-programmers-manual)
-<br/> [![Documentation](https://img.shields.io/readthedocs/fiware-tutorials.svg)](https://fiware-tutorials.rtfd.io)
 
 These tutorials wire up the dummy [JSON](https://json.org/)-based IoT devices using the
 [IoT Agent for JSON](https://fiware-iotagent-json.readthedocs.io/en/latest/usermanual/index.html#user-programmers-manual)