Use the upstream value for NGX_MAX_PROCESSES (=1024) again.
So it is safe to use `worker_processes auto;` (which sets it to
the number of CPUs). Also use this directive in the conf instead
of calculating the number in the init and passing it as argument.

Signed-off-by: Peter Stadler <peter.stadler@student.uibk.ac.at>

This fix #11610 by increasing max client body size
in nginx conf.
Bump nginx to latest version.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>

Instead of the default nginx.conf file this file is a small variant
without examples that enables the /etc/nginx/conf.d/ directory.

It will pull in all configuration files from the conf.d directory.
So, other packages can add their server parts in the conf.d directory
without modifying the main nginx.conf file (cf. #9860).

Changed also the default logging behavior:
	error_log stderr; # the init forwards it to logd
	access_log off;

See the updated documentation at:
https://openwrt.org/docs/guide-user/services/webserver/nginx

Signed-off-by: Peter Stadler <peter.stadler@student.uibk.ac.at>