{{#global-header
  class="page-header"
  onHamburgerClick=(action (mut isGutterOpen) true)}}
  {{app-breadcrumbs}}
{{/global-header}}
{{#gutter-menu
  class="page-body"
  isOpen=isGutterOpen
  onHamburgerClick=(action (mut isGutterOpen) false)}}
  {{yield}}
{{/gutter-menu}}