Merge branch 'ee-dz-remote-badges-from-readme' into 'master'

Remove badges from README.md in favor of GitLab badges feature

See merge request gitlab-org/gitlab-ee!6425

README.md

 # GitLab
 
-[![Build status](https://gitlab.com/gitlab-org/gitlab-ee/badges/master/build.svg)](https://gitlab.com/gitlab-org/gitlab-ee/commits/master)
-[![Overall test coverage](https://gitlab.com/gitlab-org/gitlab-ee/badges/master/coverage.svg)](https://gitlab.com/gitlab-org/gitlab-ee/pipelines)
-[![Code Climate](https://codeclimate.com/github/gitlabhq/gitlabhq.svg)](https://codeclimate.com/github/gitlabhq/gitlabhq)
-[![Core Infrastructure Initiative Best Practices](https://bestpractices.coreinfrastructure.org/projects/42/badge)](https://bestpractices.coreinfrastructure.org/projects/42)
-[![Gitter](https://badges.gitter.im/gitlabhq/gitlabhq.svg)](https://gitter.im/gitlabhq/gitlabhq?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
-
 ## Test coverage
 
 - [![Ruby coverage](https://gitlab.com/gitlab-org/gitlab-ee/badges/master/coverage.svg?job=coverage)](https://gitlab-org.gitlab.io/gitlab-ee/coverage-ruby) Ruby