Organization front page - projects list

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

Build projects list on Organization front page

Engineering guide

1. Use app/assets/javascripts/vue_shared/components/projects_list/projects_list.vue to render projects
2. Move app/assets/javascripts/organizations/groups_and_projects/graphql/queries/projects.query.graphql to organizations/graphql and use as query