Rationalise or describe maintainership structure of haskellfoundation on GitHub

NB: This issue relates to the maintainership structure of the [Haskell Foundation GitHub organisation](https://github.com/haskellfoundation) *not* the website. However, there doesn't seem to be a place to file issues about the organisation itself so I'm choosing this as the best alternative. (If there is such a place please let me know and I'll migrate the issue there.)

I see a couple of issues that would be helpful to address:

1. There is nowhere to file issues about the organisation itself. Perhaps a repo could be created for this pupose.
2. The Haskell Foundation Github organisation [people list](https://github.com/orgs/haskellfoundation/people) mentions Emily and Evan Relf and no one else. It would be good to rationalise this somewhat. In particular it would be helpful
1. to coherently determine who needs, or could helpfully hold, exactly what permissions and make sure that they have them (and that no one else has them), and
2. to document this decision clearly somewhere (perhaps on the repo mentioned in 1)

Beginne mit der Personenliste der Haskell Foundation GitHub-Organisation und dem bestehenden Issue-Kontext; es ist keine Repository-Datei oder kein Test angegeben. Ermittle, wo ein Issue-Tracker auf Organisationsebene und die Dokumentation zur Wartung liegen sollten, und dokumentiere anschließend die vereinbarten Berechtigungen und zuständigen Maintainer, sobald diese Entscheidung getroffen wurde.

Vom Indexierungsmodell aus dem Issue-Text verfasst.