Remove the header banner in notification emails

Rationale:

* The link to the project is already displayed in the message footer.

* Streamlining: the content of the message is better emphasized.

app/views/layouts/notify.html.haml

@@ -5,16 +5,10 @@
         GitLab
 
   %body
-    %h1{style: "background: #EEE; border-bottom: 1px solid #DDD; color: #474D57; font: normal 20px Helvetica, Arial, sans-serif; margin: 0; padding: 5px 10px; line-height: 32px; font-size: 16px;"}
-      GitLab
-      - if @project
-        \|
-        = link_to @project.name_with_namespace, project_url(@project), style: 'color: #29B; text-decoration: none'
     %table{align: "left", border: "0", cellpadding: "0", cellspacing: "0", style: "padding: 10px 0;", width: "100%"}
       %tr
         %td{align: "left", style: "margin: 0; padding: 10px;"}
           = yield
-          %br
       %tr
         %td{align: "left", style: "margin: 0; padding: 10px;"}
           %p{style: "font-size:small;color:#777"}