Merge branch 'preview' into 'getting-started'

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...esden.de/docs/application/misc/nhr_1b_applicationlist.png

...tu-dresden.de/docs/application/misc/nhr_2_projecttype.png

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...-dresden.de/docs/application/misc/nhr_7a_CPUresources.png

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...-dresden.de/docs/application/misc/nhr_8a_project_data.png

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...-dresden.de/docs/application/misc/nhr_8c_project_data.png

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...dresden.de/docs/application/project_request_form_jards.md

...resden.de/docs/application/project_request_form_jards2.md

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

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

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