title: GitHub pages index page url
body: <p>I just created my first GitHub page.</p>
  
  <p>I created new repository with the name of my user name and I pushed index.html file to master branch. Everything according to documentation.</p>
  
  <p>They said in the documentation, that i can access my index page by http(s)://username.github.io  url. 
  But I get 404 at this url. I have to type http(s)://username.github.io/USERNAME to make it working. </p>
  
  <p><a href="https://vadzvnik.github.io/vadzvnik/" rel="nofollow noreferrer">https://vadzvnik.github.io/vadzvnik/</a>  - works
  <a href="https://vadzvnik.github.io" rel="nofollow noreferrer">https://vadzvnik.github.io</a> - doesn't work</p>
  
  <p>Maybe someone already had this issue? How to make it working with out username at the end of the url?
  Thank you for your help.</p>