Add retry build button in page header, remove from sidebar

app/assets/stylesheets/pages/builds.scss

@@ -135,14 +135,6 @@
     }
   }
-  .retry-link {
-    color: $gl-link-color;
-
-    &:hover {
-      text-decoration: underline;
-    }
-  }
-
   .stage-item {
     cursor: pointer;

app/views/projects/builds/_header.html.haml

@@ -12,5 +12,7 @@
   - if @build.user
     = render "user"
   = time_ago_with_tooltip(@build.created_at)
+  - if can?(current_user, :update_build, @build) && @build.retryable?
+    = link_to "Retry", retry_namespace_project_build_path(@project.namespace, @project, @build), class: 'btn btn-white pull-right', method: :post
   %button.btn.btn-default.pull-right.visible-xs-block.visible-sm-block.build-gutter-toggle.js-sidebar-build-toggle{ role: "button", type: "button" }
     = icon('angle-double-left')

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

@@ -43,8 +43,6 @@
     .block{ class: ("block-first" if !@build.coverage && !(can?(current_user, :read_build, @project) && (@build.artifacts? || @build.artifacts_expired?))) }
       .title
         Build details
-        - if can?(current_user, :update_build, @build) && @build.retryable?
-          = link_to "Retry", retry_namespace_project_build_path(@project.namespace, @project, @build), class: 'pull-right retry-link', method: :post
       - if @build.merge_request
         %p.build-detail-row
           %span.build-light-text Merge Request: