Hi @mad,
I don’t have an nginx config kicking around, unfortunately – but see this recent post outlining how to come up with one. I suspect the problem with your current configuration is that it doesn’t distinguish between requests that should get sent through PHP (through the index.php wrapper), and requests that are for actual files in the server’s filesystem (e.g. CSS, logos, etc).
Regards,
Alec Smecher
Public Knowledge Project Team