I finally got around to updating the Showdown server to the latest version of the software. It's mostly been "reset" with just a few plugins that Mewderator suggested we keep.
At the moment the GitHub repo doesn't allow making any extra changes - I've added the current config files manually. I'm trying to decide the best way of making changes in the future without messing everything up which happened too often with the old way. It might be a second repo with just the config files which get copied to the server automatically.
Anyway, let me know what you think and if there are any problems!