GitLab

* Create _config.py

* Create _toctree.yml

* Create index.mdx

not sure about "du / ihr" oder "sie"

* Create quicktour.mdx

* Update _toctree.yml

* Update build_documentation.yml

* Update build_pr_documentation.yml

* fix build

* Update index.mdx

* Update quicktour.mdx

* Create installation.mdx

* Update _toctree.yml