adding scrollbar to docs sidebar

Author: afshinm

docs/_site/css/sticky.min.css

@@ -1 +1 @@
-.kui.sticky.element{position:fixed!important;margin-top:0!important;top:0!important}.kui.sticky.scrolled::-webkit-scrollbar{width:0;background:0 0}.kui.sticky{overflow:-moz-scrollbars-none}.kui.sticky.scrolled{overflow-x:hidden;overflow-y:scroll;-ms-overflow-style:none}
+.kui.sticky.element{position:fixed!important;margin-top:0!important;top:0!important}.kui.sticky.scrolled{overflow-x:hidden;overflow-y:scroll;}

docs/_site/feed.xml

@@ -5,8 +5,8 @@
     <description>Intro.js - Better introductions for websites and features with a step-by-step guide for your projects.</description>
     <link>http://introjs.com/docs/</link>
     <atom:link href="http://introjs.com/docs/feed.xml" rel="self" type="application/rss+xml"/>
-    <pubDate>Fri, 24 Mar 2017 19:55:53 +0430</pubDate>
-    <lastBuildDate>Fri, 24 Mar 2017 19:55:53 +0430</lastBuildDate>
+    <pubDate>Fri, 24 Mar 2017 21:09:37 +0430</pubDate>
+    <lastBuildDate>Fri, 24 Mar 2017 21:09:37 +0430</lastBuildDate>
     <generator>Jekyll v3.1.6</generator>
 
   </channel>

docs/css/sticky.min.css

@@ -1 +1 @@
-.kui.sticky.element{position:fixed!important;margin-top:0!important;top:0!important}.kui.sticky.scrolled::-webkit-scrollbar{width:0;background:0 0}.kui.sticky{overflow:-moz-scrollbars-none}.kui.sticky.scrolled{overflow-x:hidden;overflow-y:scroll;-ms-overflow-style:none}
+.kui.sticky.element{position:fixed!important;margin-top:0!important;top:0!important}.kui.sticky.scrolled{overflow-x:hidden;overflow-y:scroll;}