docs/_includes/footer.html

<footer class="footer">
  {% include footer-content.html %}
</footer>

<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script crossorigin="anonymous"
        integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa"
        src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

<!-- Anchor JS -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/anchor-js/3.2.0/anchor.min.js" type="text/javascript"></script>
<script>
  // Automatically add anchors and links to all header elements that don't already have them.
  anchors.options = { placement: 'left' };
  anchors.add();
</script>

<script>
  var shiftWindow = function () {
    if (location.hash.length !== 0) {
      window.scrollBy(0, -50);
    }
  };
  window.addEventListener("hashchange", shiftWindow);

  var highlightCurrentSidebarNav = function () {
    var href = location.pathname;
    var item = $('#sidebar-nav [href$="' + href + '"]');
    if (item) {
      var li = item.parent();
      li.addClass("active");

      if (li.parent() && li.parent().is("ul")) {
        do {
          var ul = li.parent();
          if (ul.hasClass("collapse")) {
            ul.collapse("show");
          }
          li = ul.parent();
        } while (li && li.is("li"));
      }
    }
  };

  $(document).ready(function () {
    // Scroll to anchor of location hash, adjusted for fixed navbar.
    window.setTimeout(function () {
      shiftWindow();
    }, 1);

    // Flip the caret when submenu toggles are clicked.
    $(".sidebar-submenu").on("show.bs.collapse", function () {
      var toggle = $('[href$="#' + $(this).attr('id') + '"]');
      if (toggle) {
        toggle.addClass("dropup");
      }
    });
    $(".sidebar-submenu").on("hide.bs.collapse", function () {
      var toggle = $('[href$="#' + $(this).attr('id') + '"]');
      if (toggle) {
        toggle.removeClass("dropup");
      }
    });

    // Highlight the current page on the sidebar nav.
    highlightCurrentSidebarNav();
  });
</script>