[simonw]

I found this example of another repo that is using the same trick: https://github.com/kotokaze/kotokaze.github.io

    ~ % curl -i 'https://kotokaze.github.io/'
    HTTP/2 301 
    server: GitHub.com
    content-type: text/html
    permissions-policy: interest-cohort=()
    location: http://github.kotokaze.net/