[Pkg-mailman-hackers] Bug#999861: mailman3-web: Please include instructions for migrating from mailman 2.1

[Antoine Beaupré]

Hey folks,

So with the help of this issue and a few other things found here and
there, I wrote my own upgrade docs, which should be available for folks
here:

https://gitlab.torproject.org/tpo/tpa/team/-/wikis/service/lists#mailman-2-migration

a.
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