feat(panettone): Bring back + fix irccat issue creation announcement

This reverts commit e1067b1497.

The original issue here was misusing ISSUE-ID instead of ID, but also
the associated username for the message should've been CN instead of DN

Change-Id: I1629c0cb7597ff2ee2867f27870378eecdafe126
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2125
Tested-by: BuildkiteCI
Reviewed-by: eta <eta@theta.eu.org>

web/panettone/default.nix

@@ -26,6 +26,7 @@ depot.nix.buildLisp.program {
     ./src/css.lisp
     ./src/authentication.lisp
     ./src/model.lisp
+    ./src/irc.lisp
     ./src/panettone.lisp
   ];