site/contact.md: adapt the contacts to GNU Boot

GNU boot has mailing lists and an IRC channel. This commit reflects that in
contact.md

Signed-off-by: Adrien 'neox' Bourmault <neox@gnu.org>
GNUtoo: Fixed lines over 80 characters, fixed main mailing list scope,
        grouped mailing lists together.
Acked-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

site/contact.md

@@ -1,36 +1,32 @@
 ---
 title: Contact
 x-toc-enable: true
+x-reviewed: true
 ...
 
 
-Annoucements
+Mailing lists
-============
+=============
 
-Our genuine Libreboot makes announcements in [the libreboot-annouce mailing list](https://lists.sr.ht/~libreboot/libreboot-announce).
+GNU Boot makes announcements in [the gnuboot-announce mailing
+list](gnuboot-announce@gnu.org).
 
+The [gnuboot mailing list](gnuboot@gnu.org) is the main channel for
+discussion.
 
-User discussion and support
+The [bug-gnuboot mailing list](bug-gnuboot@gnu.org) is for user
-============
+support and bug reporting
-
-The [libreboot-discuss mailing list](https://lists.sr.ht/~libreboot/libreboot-discuss) is the main channel for user discussion and support.
-
-
-Development discussion
-======================
-
-The [libreboot-dev mailing list](https://lists.sr.ht/~libreboot/libreboot-devel) is the main channel for development discussion.
-
-This is also where to send patches.
 
+And the [gnuboot-patches mailing list](gnuboot-patches@gnu.org) is
+where to send patches.
 
 IRC chatroom
 ============
 
-An IRC chatroom could be planned in the future.
+We have an IRC chatroom on Liberat.chat :
-
+[#gnuboot](https://web.libera.chat/#gnuboot)
 
 Social media
 ============
 
-Currently our genuine Libreboot does not exist officially on social media.
+Currently GNU Boot does not exist officially on social media.