ubuntu18.04: Split into multiple docker images

.gitlab-ci.yml

ubuntu18.04/base/Dockerfile

ubuntu18.04/base/agki-nas01.imp.fu-berlin.de-ca-cert.crt

ubuntu18.04/base/hdf5-1.10.2-no-trailing-attributes.patch

ubuntu18.04/cuda-devel/Dockerfile

ubuntu18.04/devel/Dockerfile

ubuntu18.04/jupyter/Dockerfile

ubuntu18.04/jupyter/jupyter_notebook_config.py

ubuntu18.04/jupyter/launch.sh

ubuntu18.04/jupyter/sshd_config