Update compose files, authelia config. Fix banner. Write galaxy_nginx.conf only if needed. Modify authelia_config_path condition. Modify get config args. Remove deploy_stack_for_current_organism.instance_url

Corrections cloud

See merge request !2

galaxy_nginx.conf jinja2 template writing, moved configuration files from 'templates' to 'files' for clarity

removed backup gspecies template file, precisions for required/optional parameters in config_example.yml