updating sagemath's public github page

[Nils Bruin]

I noticed that sagemath's

https://github.com/sagemath?view_as=public

still lists "transition from trac to github" as recent under the announcements. This was completed more than two years ago so perhaps we shouldn't announce it as recent any more. Hopefully it's quick to update for someone who is familiar with where those files live?

[Dima Pasechnik]

This README is editable for anyone on this list:
https://github.com/orgs/sagemath/teams/core?query=role%3Amaintainer
(but not for anyone else)

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