README: Replace broken mailing list link with archive#543

Merged

ambv merged 3 commits intohtml5lib:masterfrom

Mar 1, 2023

Commits on Mar 1, 2023

Replace broken mailing list link with archive
hugovk
committed
Remove mention of IRC, advertise Github Discussions

ambv
authored and
hugovk
committed
GutHib

ambv
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hugovk
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