Mention NGINX as an alternative in README

[perryflynn]

I've seen that the project will be deprecated.

Maybe you could mention NGINX as an alternative in the README then?

map $args $validproxydomain {
    default 0;
    ~https://arcgis\.example\.com/(server|arcgis|portal)/.+ 1;
}

map $args $proxydomain {
    default nonexistent.domain;
    ~^https?://(?<pd>[^/]+) $pd;
}

server {
    listen 80;
    listen [::]:80;
    server_name localhost;
    index index.html index.htm index.txt;

    location = /arcgisproxy {
        # abort when domain is not on whitelist
        if ($validproxydomain = 0) {
            return 400;
        }

        # proxy request
        expires off;
        proxy_buffering off;
        proxy_cache off;
        proxy_redirect off;
        proxy_read_timeout 300s;
        proxy_hide_header Location;
        proxy_set_header Host $proxydomain;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Scheme $scheme;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_http_version 1.1;

        proxy_pass $args;
    }
}

[perryflynn]

ping @andygup

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