Expired domain in GitHub repo description

I just stumbled upon the repository and the GitHub description:

> JupyterHub authenticator that hands out temporary accounts for everyone. For use in tmpnb.org

I noticed that tmpnb.org is no longer in use and refers to an ad-bloated website that should properly be removed from the description

Open the repository's GitHub description settings and review the current text mentioning tmpnb.org. Remove the expired domain reference, verify the updated description no longer points to tmpnb.org, and confirm that no code or tests need changing.

Written by the indexing model from the issue text.