Roles page audit PRs (round 1)

[Pey Lian Lim]

As of 2023-03-20, I have PRs for the following at https://github.com/astropy/astropy.github.com/pulls?q=is%3Aopen+is%3Apr+label%3A%22roles+and+team%22

* GSoC

* Infrastructure (I need to go back and expand this one so it is still in draft)

* specreduce

* SOSS

* Package template

* Community engagement coordinator

* Learn Team

There are a lot more roles that need to be updated, but I won't have time to do them all at once. So I will post more as they come in. Thanks for your understanding and patience!