Remove files moved to integration repo

CODE_OF_CONDUCT.rst

CONTRIBUTING.rst

Dockerfile

ci/build_dist.yml

ci/build_docker.yml

ci/deploy.yml

ci/deploy_pypi.yml

ci/general.yml

ci/pages.yml

ci/test.yml

docker-compose.yml

docker/entrypoint.sh

docker/nginx/Dockerfile

docker/nginx/nginx.conf