Serve static websites by dynamically mapping domain names and folders with nginx

nginx.conf

server {
        listen 80 default_server;
        listen [::]:80 default_server;

        root /var/www/${host}/public;

        index index.html;

        server_name _;
        gzip on;

        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
                try_files $uri $uri/ /index.html;
        }

        # 404 if a file is requested (so the main app isn't served)
        location ~ ^.+\..+$ {
                try_files $uri =404;
        }
}