add docs about proxying to sustainability chapter

js: https://lab.sub.uni-goettingen.de/verdaccio.html
maven: nexus (? fu findet raus)
docker: harbor (stefan bzw mathias finden raus)
- https://harbor.gwdg.de/harbor/projects/26/repositories
python: pypi nexus?

Edited Oct 01, 2024 by Ubbo Veentjer

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