Update moderator/conduct team contacts (#2457)

CODE_OF_CONDUCT.md

@@ -149,8 +149,8 @@ At present, the [Carbon leads](docs/project/evolution.md#carbon-leads-1) will
 serve as the conduct team. We expect to establish a dedicated conduct team if
 and when the project grows, along with more communication systems for reports.
 
-The conduct team can be emailed at carbon-lang-conduct@googlegroups.com, and
-currently has the following members:
+The conduct team can be emailed at conduct@carbon-lang.dev, and currently has
+the following members:
 
 -   Chandler Carruth (@chandlerc on Discord and
     [GitHub](https://github.com/chandlerc))
@@ -167,14 +167,15 @@ shared with new members without the permission of the reporter.
 If you believe someone is violating the code of conduct, you can report it
 several ways, including:
 
--   Asking for help on
-    [#community-help](https://discord.com/channels/655572317891461132/996113200464543804).
-    An available moderator will respond privately.
-    -   If you want to privately ask for moderator assistance, direct message a
-        moderator on Discord. Look under the Moderator list for logged in
-        moderators, and click on a moderator's name to send a message.
+-   On [Discord](https://discord.gg/ZjVdShJDAs), DM ModMail. It may require
+    confirmation that you want help on the Carbon Language server. An available
+    moderator will respond.
+    -   Look for ModMail in the user list under "Bots", and click the name to
+        send a direct message.
+    -   Moderators can also be found and messaged similarly, but ModMail is
+        preferred.
 -   Emailing the [conduct team](#conduct-team) directly at
-    carbon-lang-conduct@googlegroups.com. Bear in mind that
+    conduct@carbon-lang.dev. Bear in mind that
     [responses may take time](#what-happens-after-contacting-the-conduct-team).
 
 **All reports will be kept confidential.**