Try using the system location for nginx configuration

This will help us use the system nginx service

postinstall/postinstall.sh

@@ -85,6 +85,9 @@ PATH=$PATH:$SRCDIR/node_modules/.bin npm run-script migrate_data
 EOF
 
 echo "==== Setup nginx ===="
+rm -rf /etc/nginx/* && echo "include $NGINX_CONFIG_DIR/nginx.conf;" > /etc/nginx/nginx.conf
+unlink /etc/nginx 2>/dev/null || rm -rf /etc/nginx
+ln -s $NGINX_CONFIG_DIR /etc/nginx
 mkdir -p $NGINX_APPCONFIG_DIR
 cp $SRCDIR/postinstall/nginx/nginx.conf $NGINX_CONFIG_DIR/nginx.conf
 cp $SRCDIR/postinstall/nginx/mime.types $NGINX_CONFIG_DIR/mime.types

postinstall/setup_supervisord.sh

@@ -17,7 +17,7 @@ echo "Writing supervisor configs..."
 
 cat > /etc/supervisor/conf.d/nginx.conf <<EOF
 [program:nginx]
-command=/usr/sbin/nginx -c "$NGINX_CONFIG_DIR/nginx.conf" -p /var/log/nginx/
+command=/usr/sbin/nginx
 autostart=true
 autorestart=true
 redirect_stderr=true