remove nicescroll from wiki sidebar

app/assets/javascripts/wikis.js

 /* global Breakpoints */
 
-import 'vendor/jquery.nicescroll';
 import './breakpoints';
 
 export default class Wikis {
@@ -8,7 +7,6 @@ export default class Wikis {
     this.bp = Breakpoints.get();
     this.sidebarEl = document.querySelector('.js-wiki-sidebar');
     this.sidebarExpanded = false;
-    $(this.sidebarEl).niceScroll();
 
     const sidebarToggles = document.querySelectorAll('.js-sidebar-wiki-toggle');
     for (let i = 0; i < sidebarToggles.length; i += 1) {

app/assets/stylesheets/pages/wiki.scss

@@ -95,12 +95,22 @@
 }
 
 .right-sidebar.wiki-sidebar {
-  padding: $gl-padding 0;
+  padding: 0;
 
   &.right-sidebar-collapsed {
     display: none;
   }
 
+  .sidebar-container {
+    padding: $gl-padding 0;
+    width: calc(100% + 100px);
+    padding-right: 100px;
+    height: 100%;
+    overflow-y: scroll;
+    overflow-x: hidden;
+    -webkit-overflow-scrolling: touch;
+  }
+
   .blocks-container {
     padding: 0 $gl-padding;
   }

app/views/projects/wikis/_sidebar.html.haml

 %aside.right-sidebar.right-sidebar-expanded.wiki-sidebar.js-wiki-sidebar.js-right-sidebar{ data: { "offset-top" => "50", "spy" => "affix" } }
+  .sidebar-container
     .block.wiki-sidebar-header.append-bottom-default
       %a.gutter-toggle.pull-right.visible-xs-block.visible-sm-block.js-sidebar-wiki-toggle{ href: "#" }
         = icon('angle-double-right')