Draft: Add missing stuff from aai.helmholtz.de
Add yet-missing stuff from old aai.helmholtz.de website, after helmholtz-aai/aai.helmholtz.de!27 (merged)
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Subscribe/unsubcribe to helmholtz-aai-announcement-subscribe@fz-juelich.de👉 !671 (merged)
Edited by Uwe Jandt (DESY, HIFIS)