Update documentation and config files

config/gitlab.yml.example

doc/README.md

doc/ci/README.md

doc/ci/api/README.md

doc/ci/api/builds.md

doc/ci/api/commits.md

doc/ci/api/forks.md

doc/ci/api/projects.md

doc/ci/api/runners.md

doc/ci/docker/using_docker_build.md

doc/ci/docker/using_docker_images.md

.../examples/test-and-deploy-python-application-to-heroku.md

...ci/examples/test-and-deploy-ruby-application-to-heroku.md

doc/ci/examples/test-clojure-application.md

doc/ci/install/README.md

doc/ci/install/requirements.md

doc/ci/migration_to_omnibus/README.md

doc/ci/quick_start/README.md

doc/ci/raketasks/README.md

doc/ci/raketasks/backup_restore.md