Amend Dead Link

Author: jason-fox

README.ja.md

@@ -14,7 +14,7 @@
 ドキュメントとしても利用できます。
 
 [![Run in Postman](https://run.pstmn.io/button.svg)](https://app.getpostman.com/run-collection/d24facc3c430bb5d5aaf)
-[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/FIWARE/tutorials.Concise-Format/tree/NGSI-LD)
+[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://github.com/codespaces/new?repo=FIWARE/tutorials.Concise-Format&ref=NGSI-LD)
 
 ## コンテンツ
 

README.md

@@ -20,7 +20,7 @@ The tutorial uses [cUrl](https://ec.haxx.se/) commands throughout, but is also a
 [Postman documentation](https://fiware.github.io/tutorials.Concise-Format/ngsi-ld.html)
 
 [![Run in Postman](https://run.pstmn.io/button.svg)](https://app.getpostman.com/run-collection/d24facc3c430bb5d5aaf)
-[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/FIWARE/tutorials.Concise-Format/tree/NGSI-LD)
+[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://github.com/codespaces/new?repo=FIWARE/tutorials.Concise-Format&ref=NGSI-LD)
 
 このチュートリアルは[日本語](README.ja.md)でもご覧いただけます。