Merge branch 'preview' into longterm_preservation

.gitignore

Dockerfile

doc.zih.tu-dresden.de/docs/access/jupyterhub.md

doc.zih.tu-dresden.de/docs/access/jupyterhub_for_teaching.md

....tu-dresden.de/docs/access/jupyterhub_teaching_example.md

doc.zih.tu-dresden.de/docs/access/misc/kernelspec.png

doc.zih.tu-dresden.de/docs/access/misc/startup_hub.webm

doc.zih.tu-dresden.de/docs/archive/beegfs_on_demand.md

doc.zih.tu-dresden.de/docs/archive/install_jupyter.md

doc.zih.tu-dresden.de/docs/archive/system_venus.md

doc.zih.tu-dresden.de/docs/contrib/content_rules.md

doc.zih.tu-dresden.de/docs/contrib/contribute_container.md

doc.zih.tu-dresden.de/docs/data_lifecycle/workspaces.md

...u-dresden.de/docs/jobs_and_resources/hardware_overview.md

doc.zih.tu-dresden.de/docs/jobs_and_resources/slurm.md

...h.tu-dresden.de/docs/jobs_and_resources/slurm_examples.md

doc.zih.tu-dresden.de/docs/software/big_data_frameworks.md

...tu-dresden.de/docs/software/data_analytics_with_python.md

doc.zih.tu-dresden.de/docs/software/data_analytics_with_r.md

doc.zih.tu-dresden.de/docs/software/debuggers.md