Move languages to examples

doc/ci/examples/README.md

-# Build script examples
-+ [Test and deploy a Ruby application to Heroku](test-and-deploy-ruby-application-to-heroku.md)
-+ [Test and deploy a Python application to Heroku](test-and-deploy-python-application-to-heroku.md)
-+ [Test a Clojure application](test-clojure-application.md)
+## Build script examples
+- [Test and deploy a Ruby application to Heroku](test-and-deploy-ruby-application-to-heroku.md)
+- [Test and deploy a Python application to Heroku](test-and-deploy-python-application-to-heroku.md)
+- [Test a Clojure application](test-clojure-application.md)
+
+### Languages
+
+This is a list of languages you can test with GitLab CI. Each section has
+comprehensive documentation and comes with a test repository hosted on
+GitLab.com
+
+- [Testing PHP](php.md)

doc/ci/languages/README.md

-### Languages
-
-This is a list of languages you can test with GitLab CI. Each section has
-comprehensive documentation and comes with a test repository hosted on
-GitLab.com
-
-+ [Testing PHP](php.md)