Configure https://jberet.github.io/ to redirect to jberet.org

jberet project page currently at https://jberet.github.io. We should be able to configure it to redirect to a custom domain: https://jberet.org

github pages configuration docs: https://docs.github.com/en/pages/configuring-a-custom-domain-for-your-github-pages-site/managing-a-custom-domain-for-your-github-pages-site#configuring-an-apex-domain