Update list of maintainers in README and remove outdated infra files

[Bisaloo]

Fix #596.

I've discussed removing .mailmap and AUTHORS at the last maintainers meeting and the group was supportive of our proposal to remove these files.

They also agreed with the idea to propose a CITATION.cff file rather than CITATION but I'm not completely sure which role should be given to whom so I suggest we keep this for a later PR.

[github-actions]

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🔍 Inspect the changes: https://github.com/swcarpentry/r-novice-inflammation/compare/md-outputs..md-outputs-PR-604

The following changes were observed in the rendered markdown documents:

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⏱️ Updated at 2023-12-18 10:28:10 +0000

[isaac-jennings]

Review and support merge as per PR notes