Update README

Author: jason-fox

README.md

@@ -1,10 +1,9 @@
 [![FIWARE Banner](https://fiware.github.io/tutorials.Relationships-Linked-Data/img/fiware.png)](https://www.fiware.org/developers)
-[![NGSI LD](https://img.shields.io/badge/NGSI-LD-d6604d.svg)](https://www.etsi.org/deliver/etsi_gs/CIM/001_099/009/01.08.01_60/gs_cim009v010801p.pdf)
 
 [![FIWARE Core Context Management](https://nexus.lab.fiware.org/repository/raw/public/badges/chapters/core.svg)](https://github.com/FIWARE/catalogue/blob/master/core/README.md)
 [![License: MIT](https://img.shields.io/github/license/fiware/tutorials.Relationships-Linked-Data.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)
-<br/> [![Documentation](https://img.shields.io/readthedocs/fiware-tutorials.svg)](https://fiware-tutorials.rtfd.io)
+[![JSON LD](https://img.shields.io/badge/JSON--LD-1.1-f06f38.svg)](https://w3c.github.io/json-ld-syntax/)
 
 This tutorial discusses relationships between linked data entities and how the concepts of **JSON-LD** and **NGSI-LD**
 can be used to interrogate entities and navigate from one entity to another. The tutorial discusses a series of simple