new top-level "Credits" section

[drammock]

This PR:

• adds a new top-level website section "Credits", containing a landing page and three sub-pages:
  • Project Leadership (previously "Current Project Leadership and Institutional Partners" AKA doc/overview/people.rst)
  • Contributors (previously "Credit" AKA doc/credit.rst, which is auto-generated)
  • Sponsors (previously "Funding and other support" AKA doc/funding.rst)
• removes current/former institutional partners from the "people" page (it was in 2 places before); now they're only on the "sponsors" page
• on the "sponsors" page, separates the funding into current/former (to mirror how institutional partners are handled on that same page)
• adds logos to the "sponsors" page
• reduces the funder and institutional partner logos on the homepage to only the current sponsors
• adds Steph Jones to the advisory board (was originally invited during a sabbatical, but has since returned and accepted)
• side quest: pull the massive dict of institutions out of conf.py and into a dedicated YAML file.

The main motivation for this is to make current support more prominent, as incentive to potential institutional sponsors (fewer homepage logos / dedicated "current sponsors" section == better visibility)

[larsoner]

FYI these errors

/home/circleci/project/mne/time_frequency/tfr.py:docstring of mne.time_frequency.tfr.EpochsTFR:59: WARNING: py:mod reference target not found: joblib [ref.mod]

are being fixed in #13938, which should merge imminently

[larsoner]

Looks good to me! Style CIs are not happy with you though 😄

[drammock]

Looks good to me! Style CIs are not happy with you though 😄

Time to take a look at our pre-commit config. There shouldn't be conflicts between what it wants and what style CI job wants

[larsoner]

pre-commit also failed

But the style job in general does run more stuff than pre-commit, IIRC for speed reasons (e.g. vulture is too slow to run on every commit and operates on the repository as a whole not individual files)