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This PR removes Ruby 3.0 and 3.1 that are EOL.
I took the chance to perform a few code cleanups, including the conversion of all docs into Markdown, that has superseded Textile.
It fixes the broken build, as commented in #556 (comment).
/cc @floere it probably deserves a major version bump as some devs may rely on older Rubies. Happened to me in the past.
Blocks #556