update home page to point to groups.io instead of defunct lists.gag.com

diff --git a/index.mdwn b/index.mdwn
index ea8f91287aa1eee086e3e642fec80d562c7e478e..cf4847a243efd7e7ec3b54902f92f1d24af9cc9f 100644 (file)
--- a/index.mdwn
+++ b/index.mdwn
@@ -194,8 +194,8 @@ learn a lot and see some great flights by showing up at a club launch.
 
 As we make progress, you can read about it in our [News](News) feed.  Feel
 free to subscribe to our 
-[mailing list](https://lists.gag.com/mailman3/postorius/lists/altusmetrum.lists.gag.com/).
-We also hang out on IRC channel #altusmetrum on irc.oftc.net if you have
+[mailing list](https://groups.io/g/altusmetrum).  We also hang out on 
+IRC channel #altusmetrum on irc.oftc.net if you have
 questions that aren't answered here.  You can also find us on 
 [Facebook](http://www.facebook.com/group.php?gid=341167482968), though note
 we don't check Facebook very often.