Default use of NGINX and general improvements

[mjanez]

Summary of changes: Summary of changes: Configuration:.

• Configuration: NGINX implemented as default web server.

  • Implementation of NGINX as the default web server.
  • Tweaked and updated environment variables in .env.example.

• Project structure:.

  • Move docker-compose files for Apache to examples.

• Documentation

  • Updated README.md and info_envfile.md to reflect new changes and provide clear guidelines.

• Continuous integration:

  • Refactored the GitHub actions workflow to use environment variables in the branch name.

• Services:.

  • Enhancements to the ckan-pycsw service with new environment variables and SSL configuration modes.