[Suggestion] Avoid the use of if (nginx) using only try_files

[ThecaTTony]

Hi, it will be better to replace this nginx conf with one that only use try_files directive.

WikiDocs/README.md

Lines 102 to 107 in fbc7b95

	location / {
	if (!-e $request_filename){
	rewrite ^/(.*)$ /index.php?doc=$1 last;
	}
	try_files $uri $uri/ =404;
	}

In the above example =404 its never used, because the rewrite rule prevent that. This is a better aproach:

location / {
        try_files       $uri $uri/ @wikidocsrw;
}
location @wikidocsrw {
        rewrite         ^/(.*)$ /index.php?doc=$1 last;
}

So everytime something will end up on 404 it will be handled by the @wikidocsrw location.

Also, this is a example to serve WikiDocs on a subdirectory using nginx:

# wikidocs
location / {
        return          301 /wikidocs;
}
location ~* /wikidocs/(.+)\.(css|gif|ico|jpg|jpeg|js|png|svg)$ {
        try_files       $uri =404;
        add_header      Cache-Control "public, max-age=3600";
}
location ~* /wikidocs/(.+)\.md$ {
        return          301 /wikidocs;
}
location = /wikidocs/datasets/config.inc.php {
        deny            all;
}
location /wikidocs {
        index           /wikidocs/index.php;
        try_files       $uri $uri/ @wikidocsrw;
}
location @wikidocsrw {
        rewrite         ^/wikidocs/(.*)$ /wikidocs/index.php?doc=$1 last;
}
location ~ /wikidocs/(.+)\.php$ {
        fastcgi_index                   /wikidocs/index.php;
        fastcgi_pass                    unix:/run/php-fpm/php-fpm.sock;
        fastcgi_intercept_errors        on;
        include                         fastcgi.conf;
}

I hope it helps.