Changes:
- add config validation option via Makefile
- add `default-http{,s}-port` commands to add_servers.py
- update add_servers.py to pass generic parameters to servers in templates
- add nginx_conf.d directory usage for more than one custom nginx configurations
- rename `port` and `ssl_port` to `http{,s}_port` for templates
- add `http{,s}_custom_params` to templates
Changes:
- fix README.md old json format usage
- rename "redirect" option to "proxy_pass"
- move docker-compose.yml and nginx.conf.j2 to examples and add to .gitignore
- fix situation when one domain from domains.txt and servers.yaml appeared twice in nginx.conf
