[media] Use delfin instead of jellyfin

This is potentially temporary. But jellyfin-media-player has been
flagged as having a security problem by using an old version of
qtwebengine. So we'll maybe find time to try out delfin or maybe just
wait until the security issue gets fixed or maybe just use the web
browser. We have options

home/roles/media/default.nix

@@ -13,7 +13,9 @@ in
   config = mkIf cfg.enable {
     home.packages = with pkgs; [
       # Media players and streaming
-      jellyfin-media-player
+      # Using delfin instead of jellyfin-media-player to avoid qtwebengine security issues
+      # For full Jellyfin features, use web interface at http://jellyfin-server:8096
+      delfin
       moonlight-qt
       vlc
     ];