[gopher] mail list sign-up link update

[simple at sdf.lonestar.org]

Thanks for the smooth list transisition.

I think the old sign-up link needs updating:

http://gopher.quux.org:70/Software/Gopher/Mailing%20List.txt

"A mailing list for gopher discussions, questions, and advocacy is available.
To susbscribe, send an e-mail with the word SUBSCRIBE in the subject line to
gopher-request at complete.org."

Unless maybe that still works.

Cheers,
Jeff