If you access any GitHub Pages websites at
<username>.github.com (emphasis on the
.com), please use
<username>.github.io instead (emphasis on the
.io). This doesn’t apply for GitHub-owned sites like
pages.github.com, but does apply to user and project sites like
Please give the whole post a read for schedules on brownouts where GitHub will turn off these redirects for a shorter period of time before turning it off completely on April 15, 2021.