There is no notice or any warnings from authors regarding antd design framework. Such a huge OSS project members should be responsible in notifying before.
Aha - according to this Reddit thread [0], the main repo for Ant Design has moved to a Chinese equivalent of Github, and can now be found here [1]. No news on the documentation/website yet though.
https://github.com/ant-design/ant-design - missing
https://github.com/ant-design/ - still there