Could you please install the MathJax extension on the wiki? It does the same thing as the Math extension, but apparently renders more prettily and has a few more features.
Oh wait – the Math extension already has MathJax. You just have to enable it: “Set $wgUseMathJax to enable MathJax rendering mode; it is still somewhat experimental. For now, users will have to opt in to MathJax on their preferences.”
Done!
Sorry, apparently even if MathJax is enabled, the user has to enable it in their preferences… and since we don’t have users, it can’t be set. Probably best to disable MathJax until it is better supported 