Added nginx dockerfile generator (#171)

* Added nginx dockerfile generator

* Applied requested changes

* Update src/nginxconfig/generators/to_conf.js

Co-authored-by: Matt (IPv4) Cowley <me@mattcowley.co.uk>

* Update src/nginxconfig/generators/to_conf.js

Co-authored-by: Matt (IPv4) Cowley <me@mattcowley.co.uk>

* Update src/nginxconfig/templates/global_sections/docker.vue

Co-authored-by: Matt (IPv4) Cowley <me@mattcowley.co.uk>

* Update src/nginxconfig/i18n/en/common.js

Co-authored-by: Matt (IPv4) Cowley <me@mattcowley.co.uk>

* Update src/nginxconfig/i18n/en/templates/global_sections/docker.js

Co-authored-by: Matt (IPv4) Cowley <me@mattcowley.co.uk>

Co-authored-by: Matt (IPv4) Cowley <me@mattcowley.co.uk>