nginx: configuration update

Restructure the main configuration file to simplify custom configuration:
* support inclusion of configuration fragments from subdirectories:
  - /etc/nginx/modules-enabled/*.conf
  - /etc/nginx/conf.d/*.conf
  - /etc/nginx/sites-enabled/*
* default site (port 80):
  - move into /etc/nginx/sites-available/default_server
    and enable via symlink in /etc/nginx/sites-enabled/
  - listen on IPv6
  - drop unneeded example fragments
* configure and enable gzip
* update TLS settings to drop SSLv3 and enable TLSv1.3 for some safer
  defaults
* update remaining bits to follow Debian standard configuration
  https://salsa.debian.org/nginx-team/nginx/blob/62a54a8ba66ee6cc1b4f8a33dab9a6f27a3fdac4/debian/conf/nginx.conf
* drop unneeded example configuration bits from /etc/nginx/*.default

These changes, in particular the configuration fragment
support allow to easily customise nginx based on individual
requirements.
In addition, it is now possible for other recipes / packages
to drop fragments into the respective directories in /etc/nginx
without having to meddle with /etc/nginx/nginx.conf

Signed-off-by: André Draszik <andre.draszik@jci.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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