Remove link to distutils-sig mailing list

This list has been made read-only, so it's no longer possible to "ask
questions or get involved" there

Author: matthewhughes934

docs/html/development/index.rst

@@ -8,8 +8,7 @@ testing, and documentation.
 
 You can also join ``#pypa`` (general packaging discussion and user support) and
 ``#pypa-dev`` (discussion about development of packaging tools) `on Libera.chat`_,
-or the ``#pip`` channel on the `PyPA Discord`_, or the `distutils-sig mailing list`_,
-to ask questions or get involved.
+or the ``#pip`` channel on the `PyPA Discord`_, to ask questions or get involved.
 
 .. toctree::
     :maxdepth: 2
@@ -28,5 +27,4 @@ to ask questions or get involved.
     references might be broken.
 
 .. _`on Libera.chat`: https://kiwiirc.com/nextclient/#ircs://irc.libera.chat:+6697/pypa-dev
-.. _`distutils-sig mailing list`: https://mail.python.org/mailman3/lists/distutils-sig.python.org/
 .. _`PyPA Discord`: https://discord.gg/pypa