Add main and headers tags in layout (RGAA 9.2.1)

app/views/layouts/_new_header.haml

@@ -3,7 +3,7 @@
 - dossier = controller.try(:dossier_for_help)
 - procedure = controller.try(:procedure_for_help)
 
-.new-header{ class: current_page?(root_path) ? nil : "new-header-with-border" }
+%header.new-header{ class: current_page?(root_path) ? nil : "new-header-with-border" }
   .header-inner-content
 
     .flex.align-center

app/views/layouts/application.html.haml

@@ -33,6 +33,7 @@
           Env Test
 
       = render partial: "layouts/new_header"
+      %main
         = render partial: "layouts/flash_messages"
         = content_for?(:content) ? yield(:content) : yield