Refactor styles for merge requests list

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/pages/merge_requests.scss

@@ -148,15 +148,8 @@
     position: relative;
 
     .merge-request-title {
-      margin-bottom: 5px;
-      font-size: $list-font-size;
-      font-weight: 600;
+      margin-bottom: 2px;
     }
-
-    .merge-request-info {
-      color: $gl-gray;
-    }
-
   }
 
   .merge-request-labels {

app/views/projects/merge_requests/_merge_request.html.haml

 %li{ class: mr_css_classes(merge_request) }
   .merge-request-title
     %span.merge-request-title-text
-      = link_to_gfm merge_request.title, merge_request_path(merge_request), class: "row_title"
+      = link_to_gfm merge_request.title, merge_request_path(merge_request), class: "title"
     %ul.controls.light
       - if merge_request.merged?
         %li

app/views/shared/_merge_requests.html.haml

@@ -8,7 +8,7 @@
           .pull-right
             = link_to 'New merge request', new_namespace_project_merge_request_path(project.namespace, project)
 
-      %ul.well-list.mr-list
+      %ul.content-list.mr-list
         - group[1].each do |merge_request|
           = render 'projects/merge_requests/merge_request', merge_request: merge_request
   = paginate @merge_requests, theme: "gitlab"