Fix missing paddings in admin area

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

app/views/admin/dashboard/index.html.haml

-.admin-dashboard
+.admin-dashboard.prepend-top-default
   .row
     .col-md-4
       %h4 Statistics

app/views/admin/deploy_keys/index.html.haml

 - page_title "Deploy Keys"
-.panel.panel-default
+.panel.panel-default.prepend-top-default
   .panel-heading
     Public deploy keys (#{@deploy_keys.count})
     .controls

app/views/admin/labels/index.html.haml

 - page_title "Labels"
-= link_to new_admin_label_path, class: "pull-right btn btn-nr btn-new" do
+
+%div
+  = link_to new_admin_label_path, class: "pull-right btn btn-nr btn-new" do
     New label
-%h3.page-title
+  %h3.page-title
     Labels
 %hr
 

app/views/admin/runners/index.html.haml

-%p.lead
+%p.lead.prepend-top-default
   %span
     To register a new runner you should enter the following registration token.
     With this token the runner will request a unique runner token and use that for future communication.