GH Pages SPA hack

404.html

http://www.backalleycoder.com/2016/05/13/sghpa-the-single-page-app-hack-for-github-pages/
<script>
  sessionStorage.redirect = location.href;
</script>
<meta http-equiv="refresh" content="0;URL='http://MY_PROJECT_HERE.github.io'"></meta>

index.html

<!-- approach from http://www.backalleycoder.com/2016/05/13/sghpa-the-single-page-app-hack-for-github-pages/ -->
<script>
  (function(){
    var redirect = sessionStorage.redirect;
    delete sessionStorage.redirect;
    if (redirect && redirect != location.href) {
      history.replaceState(null, null, redirect);
    }
  })();
</script>