DOC: update Steering Council membership and people on governance page

We welcome two new SC members, Melissa and Inessa.

The people moving to emeritus status have not been very active or not
active at all for a while. They all still have commit rights, and if
they get more active again their membership can be restored.

There are also a few changes to the NumFOCUS Subcommittee and
Institutional Partners members, to reflect recent changes.

After this update, all listed people are currently actively contributing
to NumPy. That does not only include technical contributions, but also
participating in community meetings, mentoring newcomers, and many
other activities across the project.

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