Remove an unnecessary element from every page

Almost every page is affected.
Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

app/views/layouts/_page.html.haml

@@ -19,7 +19,6 @@
       = yield :customize_homepage_banner
       - unless @hide_breadcrumbs
         = render "layouts/nav/breadcrumbs"
-      .d-flex
     %div{ class: "#{(container_class unless @no_container)} #{@content_class}" }
       .content{ id: "content-body" }
         = render "layouts/flash", extra_flash_class: 'limit-container-width'

changelogs/unreleased/drop-an-element.yml

+---
+title: Remove an unnecessary element from every page
+merge_request: 42769
+author: Takuya Noguchi
+type: other