celeryproject.org can't be visited

[ziqiangxu]

Checklist

• [ ] I have checked the issues list for similar or identical bug reports.
• [ ] I have checked the pull requests list for existing proposed fixes.
• [ ] I have checked the commit log to find out if the bug was already fixed in the master branch.
• [ ] I have included all related issues and possible duplicate issues in this issue (If there are none, check this box anyway).

Related Issues and Possible Duplicates

Related Issues

• None

Possible Duplicates

• None

Description

but it shows on the right navigation bar on page https://github.com/celery/celery/

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