Update teams listed on About Us page
Update teams listed on About Us page

Note: some of this still needs to be formalized. It's a subset of
what we discussed in the Nov '19 sprint (see
https://github.com/numpy/archive/blob/master/sprints/2019-11-22.md),
the part we already effectively have.

numpy/numpy.org,numpy/numpy.org,numpy/numpy.org,numpy/numpy.org