title: Subdomain to default github pages domain
body: <p>I communicated the wrong URL to many people for my github pages site:<br>
  I gave them the URL <code>https://www.[username].github.io</code> instead of <code>https://[username].github.io</code>...<br>
  I feel super dumb about it, but it's hard for me to notify the people of the change.<br>
  Is there a way to redirect <code>https://www.[username].github.io</code> to <code>https://[username].github.io</code> from the github pages projet ?</p>
  
  <p>Or is there another way to fix this ?
  Any help would be very welcome, I'm quite desperate here :/</p>