Revert "DOC: Spihnx theme, don't sticky nav on api ref page, toc too long to fit on screen"

This reverts commit 3e618c8.

Author: y-p

doc/source/themes/nature_with_gtoc/layout.html

@@ -68,35 +68,26 @@ <h3 style="margin-top: 1.5em;">{{ _('Search') }}</h3>
 </div>
 
 <script type="text/javascript">
-    $(function () {
-
-        var chapter = window.location.href.split("/").pop()
-        if (chapter.indexOf("api.html") === 0) {
-            // don't sticky the nav when in the API doc,
-            // TOC too long to fit on screem
-            return
+    // http://movethewebforward.org/
+    // paul irish et al. we <3 you.
+    var $body = $( document.body );
+
+    var $scrollable = $(window); // default scrollable thingy, which'll be body or docEl (html)
+    $originalnavtop =52; //$scrollable.css('top');
+
+    // work on scroll, but debounced
+    var $document = $(document).scroll( function() {
+        var $nav = $("div.sphinxsidebar");
+        if($scrollable.scrollTop() > ($originalnavtop - 20)) {
+            $nav.addClass('sticky').css('top', '0');
+            $nav.addClass('sticky').css('position', 'fixed');
+        } else {
+            $nav.removeClass('sticky');
+            $nav.addClass('sticky').css('position', '');
+            $nav.addClass('sticky').css('top', '');
         }
-        // http://movethewebforward.org/
-        // paul irish et al. we <3 you.
-        var $body = $(document.body);
-
-        var $scrollable = $(window); // default scrollable thingy, which'll be body or docEl (html)
-        $originalnavtop = 52; //$scrollable.css('top');
-
-        // work on scroll, but debounced
-        var $document = $(document).scroll(function () {
-            var $nav = $("div.sphinxsidebar");
-            if ($scrollable.scrollTop() > ($originalnavtop - 20)) {
-                $nav.addClass('sticky').css('top', '0');
-                $nav.addClass('sticky').css('position', 'fixed');
-            } else {
-                $nav.removeClass('sticky');
-                $nav.addClass('sticky').css('position', '');
-                $nav.addClass('sticky').css('top', '');
-            }
-
-        });
-    })
+
+    });
 </script>
 
 {%- endblock %}