Lightest CMS in the world

Now default pages are served from /app/copy folder from .html and .markdown.
Only if such page does not exist the rest of routes take over.

Signed-off-by: Zeljko <zeljko@zwr.fi>
error message when wrong extension

Now when a file in the /app/copy folder exists with unsupported extension,
it is said so, rather then just Not Found.

Signed-off-by: Zeljko <zeljko@zwr.fi>