Use `render_ee` and `render_ce` to achieve
layer-by-layer expansion of views:
1.  jh/app/views/layouts/_page.html.haml
2.  ee/app/views/layouts/_page.html.haml
3.  app/views/layouts/_page.html.haml

See: https://gitlab.com/gitlab-jh/gitlab/-/merge_requests/52