remove old mailing list archive references

the old archives were merged into the new archives.

README.rst

@@ -121,8 +121,7 @@ Links
  * `GitHub <https://github.com/borgbackup/borg>`_
  * `Issue Tracker <https://github.com/borgbackup/borg/issues>`_
  * `Bounties & Fundraisers <https://www.bountysource.com/teams/borgbackup>`_
- * `New Mailing List <https://mail.python.org/mailman/listinfo/borgbackup>`_
- * `(Old Mailing List's Archives <http://librelist.com/browser/borgbackup/>`_)
+ * `Mailing List <https://mail.python.org/mailman/listinfo/borgbackup>`_
  * `License <https://borgbackup.github.io/borgbackup/authors.html#license>`_
 
 Notes

docs/support.rst

@@ -33,10 +33,6 @@ New Mailing List:
 Just read that page to find out about the mailing list, its topic, how to subscribe,
 how to unsubscribe and where you can find the archives of the list.
 
-We used a different mailing list before, you can still read its archives there:
-
-`Old Mailing List's Archives <http://librelist.com/browser/borgbackup/>`_
-
 Bounties and Fundraisers
 ------------------------