{mattermost,matterircd}: relocate to by-name

pkgs/by-name/ma/matterircd/package.nix

@@ -20,6 +20,6 @@ buildGoModule rec {
     mainProgram = "matterircd";
     homepage = "https://github.com/42wim/matterircd";
     license = licenses.mit;
-    maintainers = [ ];
+    maintainers = with maintainers; [ numinit ];
   };
 }

pkgs/top-level/all-packages.nix

@@ -24486,9 +24486,6 @@ with pkgs;
 
   matrix-alertmanager = callPackage ../servers/monitoring/matrix-alertmanager { };
 
-  mattermost = callPackage ../servers/mattermost { };
-  matterircd = callPackage ../servers/mattermost/matterircd.nix { };
-
   mattermost-desktop = callPackage ../applications/networking/instant-messengers/mattermost-desktop { };
 
   memcached = callPackage ../servers/memcached { };