Server won't render 404.html: "File not found. Sorry."

[Borja o'Cook]

The pollen server won't let you access a file named 404.html if its at the root of the pollen project, as it clashes with the built-in 404.html page. I see you added a custom 404 message for the server in #94 so this file might be something that was never removed after that.

[sorawee]

More generally, everything in the server-extras directory will override existing files. favicon.ico is another one that it probably should not do that.

[Matthew Butterick]

Thanks for the report!