Merge branch 'install-redirections-to-hifis.net' into 'master'

_posts/2020/11/2020-11-20-helmholtz-aai-policies.md

_posts/2021/01/2021-01-26-1000-users.md

...1/02/2021-02-09-connected-centres-update-including-hgs.md

_posts/2021/03/2021-03-22-support-of-multiple-namespaces.md

_posts/2021/03/2021-03-23-helmholtz-aai-in-dfn-meeting.md

_posts/2021/04/2021-04-14-helmholtz-aai-in-nfdi-meeting.md

_posts/2021/06/2021-06-23-how-to-helmholtz-aai.md

_posts/2021/08/2021-08-19-new-guidelines.md

_posts/2021/08/2021-08-20-support-punch4nfdi.md

...1-10-22-helmholtz-aai-full-presentation-in-dfn-meeting.md

concepts/index.md

faq.md

howto/index.md

index.md

news/index.md

policies/index.md