Remove page-with-new-nav class

app/assets/stylesheets/framework/header.scss

-.content-wrapper.page-with-new-nav {
-  margin-top: $header-height;
-}
-
 .navbar-gitlab {
   @include new-style-dropdown;

app/assets/stylesheets/framework/layout.scss

@@ -24,6 +24,7 @@ body {
 }
 .content-wrapper {
+  margin-top: $header-height;
   padding-bottom: 100px;
 }

app/views/layouts/_page.html.haml

 .page-with-sidebar{ class: page_with_sidebar_class }
   - if defined?(nav) && nav
     = render "layouts/nav/sidebar/#{nav}"
-  .content-wrapper.page-with-new-nav
+  .content-wrapper
     = render 'shared/outdated_browser'
     .mobile-overlay
     .alert-wrapper