Create a custom 404 Not Found page in Nginx. By the way, 410 too.

server {
    listen 80;
    server_name 'ast.qt-space.com';

    error_page 404 /static/onepage/custom_404.html;
    error_page 410 /static/onepage/custom_410.html;

    location '/static/' {
        alias /home/simple_db/static/;
    }

    location / {
        return 404;
    }
}