Merge branch 'bootstrap4' into 'master'

.dockerignore

.gitignore

.gitlab-ci.yml

Dockerfile

README.md

data.d/certs.disabled

data.d/dns.json

docker/build.sh

docker/conf/apache2/sites-available/000-default.conf

obsolete/policy.de.md

obsolete/policy.en.md

obsolete/policy.es.md

obsolete/policy.it.md

obsolete/policy.pt.md

obsolete/your_data.en.md

package.json

render-test/.gitignore

render-test/render_test.py

render-test/tox.ini

scripts/run-test-server.sh