Organization front page - page header

Designs: https://gitlab.com/gitlab-org/gitlab/uploads/836ae78a41db75db022c75c367dda231/Organization___Overview___Group_view.png

Build page header on Organization front page

Engineering guide

1. Pass organization name, visibility, and ID to frontend via data attributes
2. Use app/assets/javascripts/vue_shared/components/modal_copy_button.vue for the copy button