message: gh-pages: add 404.html redirecting to index.html
diff: <!-- /Loader before any JS -->
  </div>
  <div id="portal"></div>
  +
  + <!-- Start Single Page Apps for GitHub Pages -->
  + <script type="text/javascript">
  + // Single Page Apps for GitHub Pages
  + // https://github.com/rafrex/spa-github-pages
  + // Copyright (c) 2016 Rafael Pedicini, licensed under the MIT License
  + // ----------------------------------------------------------------------
  + // This script checks to see if a redirect is present in the query string
  + // and converts it back into the correct url and adds it to the
  + // browser's history using window.history.replaceState(...),
  + // which won't cause the browser to attempt to load the new url.
  + // When the single page app is loaded further down in this file,
  + // the correct url will be waiting in the browser's history for
  + // the single page app to route accordingly.
  + (function(l) {
  + if (l.search) {
  + var q = {};
  + l.search.slice(1).split('&').forEach(function(v) {
  + var a = v.split('=');
  + q[a[0]] = a.slice(1).join('=').replace(/~and~/g, '&');
  + });
  + if (q.p !== undefined) {
  + window.history.replaceState(null, null,
  + l.pathname.slice(0, -1) + (q.p || '') +
  + (q.q ? ('?' + q.q) : '') +
  + l.hash
  + );
  + }
  + }
  + }(window.location))
  + </script>
  + <!-- End Single Page Apps for GitHub Pages -->
  +
  <script src="https://swap.online/dist/js/swap.js?ver=1.0.7"></script>
  </body>
  