Draft: Correcting some typos, project architecture changed

Recovery of the project:

• moving Ansible and sysadmin-related files to ansible/playbooks/files/
• because the nginx docker was not working, setup of the webserver with Ansible (metrics part not maintained for now)
• using docker compose v2 instead of the old docker-compose tool
• upgrading some playbooks with better logic handling
  • new argument --remove-orphans while shutting down containers
• typos corrections