Fix broken links in developer portal article (#306)

docs/articles/dev-portal-configuration.md

@@ -10,15 +10,14 @@ file with additional properties, you directly enable more content show up in the
 Developer Portal.
 
 Read more about OpenAPI and all the possibilities
-[here](https://oai.github.io/Documentation/specification).
+[here](https://github.com/OAI/OpenAPI-Specification).
 
 ## Supported OpenAPI Versions
 
 Zuplo has full support for features within OpenAPI 3.1. If you are still on
 OpenAPI 3.0, then most features will still be supported within the Developer
 Portal. OpenAPI 2.x / Swagger or earlier is not supported at this time. There
 are multiple solutions to convert your OpenAPI 2.x document - including
-[web tools](https://mermade.org.uk/openapi-converter),
 [CLI, and API](https://stackoverflow.com/questions/59749513/how-to-convert-openapi-2-0-to-openapi-3-0).
 
 ## Handling Multiple OpenAPI Files