Update README.md

Author: kemister85

README.md

@@ -8,7 +8,6 @@ This project is built using [Antora](https://antora.org/), a powerful documentat
 
 To contribute to the TinyMCE documentation project, please review the following resources:
 
-- [TinyMCE Documentation - Contributor's Guide](https://www.tiny.cloud/docs/configure/contributing-docs/)
 - [GitHub - How to contribute to TinyMCE’s documentation](https://github.com/tinymce/tinymce-docs/blob/main/CONTRIBUTING.md#how-to-contribute-to-tinymces-documentation)
 
 These guides cover contribution guidelines, project structure, style conventions, and best practices for submitting changes.