Ask HN: what are your ideas for a secure website?

Does anyone have any new ideas for how to make a secure website?

My idea is for a "compiled webserver" which has nothing but the OS kernel, TCP/IP stack and a compiled web application, all compiled into a single executable. The (optional) file system is read only. So there's nothing even to log in to.

Does anyone else have ideas for how to make a website super secure?