Update contact info

Signed-off-by: Gris Ge <[email protected]>

index.md

@@ -81,11 +81,12 @@ interfaces:
 - [nmpolicy](https://nmstate.io/nmpolicy)
 
 ## Contacts
-- You can find us on #nmstate IRC channel on [Libera](https://libera.chat/).
+- You can find us on Matrix room: [`#nmstate:fedora.im`][matrix_room_url]
   The maintainers are Gris, edwardh and ffmancera, please feel free to ask
   whatever you need!
 
 - Nmstate uses the [github issue][github_issue_url] for discussion or bug
   report.
 
 [github_issue_url]: https://github.com/nmstate/nmstate/issues
+[matrix_room_url]: https://matrix.to/#/#nmstate:fedora.im