docs: announce the new matrix pg room (#254)

README.md

@@ -45,7 +45,7 @@ They also should be subscribed to Ansible's [The Bullhorn newsletter](https://do
 
 We announce important development changes and releases through Ansible's [The Bullhorn newsletter](https://docs.ansible.com/ansible/devel/community/communication.html#the-bullhorn). If you are a collection developer, be sure you are subscribed.
 
-Join us in the `#ansible` (general use questions and support), `#ansible-community` (community and collection development questions), and other [IRC channels](https://docs.ansible.com/ansible/devel/community/communication.html#irc-channels) on [Libera.Chat](https://libera.chat).
+Join us in the `#postgresql:ansible.com` [room](https://matrix.to/#/#postgresql:ansible.com) on Matrix, the `#ansible` (general use questions and support), `#ansible-community` (community and collection development questions), and other [IRC channels](https://docs.ansible.com/ansible/devel/community/communication.html#irc-channels) on [Libera.Chat](https://libera.chat).
 
 We take part in the global quarterly [Ansible Contributor Summit](https://github.com/ansible/community/wiki/Contributor-Summit) virtually or in-person. Track [The Bullhorn newsletter](https://docs.ansible.com/ansible/devel/community/communication.html#the-bullhorn) and join us.
 

docs/docsite/links.yml

@@ -32,7 +32,7 @@ extra_links:
 communication:
   matrix_rooms:
     - topic: General usage and support questions
-      room: '#users:ansible.im'
+      room: '#postgresql:ansible.com'
   irc_channels:
     - topic: General usage and support questions
       network: Libera