Habilitar y redirigir a https

[andyrufasto]

Usa una conexion segura para la página web, muchos navegadores nisiquiera permiten conectarse a sitios sin https.
Veo que usan github pages, quizá este mal configurado los registros dns, añado links:

https://docs.github.com/en/github/working-with-github-pages/securing-your-github-pages-site-with-https
https://docs.github.com/en/github/working-with-github-pages/managing-a-custom-domain-for-your-github-pages-site