docker: change user to www-data

docker/nginx/nginx.conf

@@ -1,14 +1,16 @@
 # This and proxy.conf are based on
 # https://github.com/dead-guru/devichan/blob/master/nginx/nginx.conf
 
-user  leftypol;
+user www-data;
 worker_processes auto;
 
 error_log /dev/stdout warn;
-pid        /var/run/nginx.pid;
+pid       /var/run/nginx.pid;
+
 events {
 	worker_connections  1024;
 }
+
 http {
 	include       /etc/nginx/mime.types;
 	default_type  application/octet-stream;