I could not find an official source/article implying GitHub replacing Azure DevOps.
Azure DevOps is currently not supported on Microsoft Q&A. Please post your questions on https://developercommunity.visualstudio.com/spaces/21/index.html
The Azure DevOps team and community are active and answering questions there.
You can also ask for help here https://stackoverflow.com/questions/tagged/azure-devops. Thanks.