Nginx WP/CI Confusion

server {
    listen 80;
    server_name dimasrocks.com;
    root /var/www/dimasrocks.com/public_html;
    index index.php index.html index.htm;
    #access_log logs/host.access.log;

location  / {
        # this serves static files that exist without running other rewrite tests
        if (-f \$request_filename) {
            expires 30d;
            break;
        }
        # this sends all non-existing file or directory requests to index.php
        if (!-e $request_filename) {
            rewrite ^/css/(.)$ /wp-content/themes/roots/css/$1 last;
            rewrite ^/js/(.)$ /wp-content/themes/roots/js/$1 last;
            rewrite ^/img/(.)$ /wp-content/themes/roots/img/$1 last;
            rewrite ^/plugins/(.)$ /wp-content/plugins/$1 last;
            rewrite ^(.+)$ /index.php last;
        }
    }

    location = /favicon.ico {
        log_not_found off;
        access_log off;
    }
    location = /robots.txt {
        allow all;
        log_not_found off;
        access_log off;
    }
    location ~ \.php$ {
        root public_html;
        fastcgi_pass 127.0.0.1:9000;
        fastcgi_param SCRIPT_FILENAME /var/www/dimasrocks.com/public_html/$fastcgi_script_name;
        include fastcgi_params;
    }
    location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
        expires max;
        log_not_found off;
        root /var/www/dimasrocks.com/public_html/;
    }
}