Move inactive experts to emeritus status

[AA-Turner]

We suggest and recommend using the Experts Index for contributors to find a relevant committer/core developer to review a PR or comment on an issue/proposal. Listing names of inactive committers, those who have left the team, or those that never moved from BPO to GitHub can create a frustrating contributor experience.

I've split this change into 5 commits:

• Remove all entries marked as "inactive"
• Remove all those marked "inactive" by the voters script (i.e. no commits in the last 2 years and no explict 'stay active' response)
• Remove all those who are marked as no longer a core developer (with a left = "..." entry)
• Remove all former BPO usernames (^ entries)
• Remove all those with no commits in the last 5 years, regardless of 'stay active' voter status

We can of course re-add people at any time, this is more of a housekeeping activity than anything else.

A

(I've requested review from the currently listed devguide experts: @merwok @ezio-melotti @willingc @Mariatta @hugovk)

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📚 Documentation preview 📚: https://cpython-devguide--1635.org.readthedocs.build/