Joomla Update

[Llewellynvdm]

Update Joomla Docker documentation to improve clarity and enhance configuration options

• Changed container network configuration to use Docker networks instead of linking containers.
• Introduced new environment variables for database configuration:
  • JOOMLA_DB_PASSWORD_FILE: Path to a file containing the database password.
  • JOOMLA_DB_TYPE: Database type with options for "mysqli" and "pgsql".
• Added environment variables for auto-deployment configuration:
  • JOOMLA_SITE_NAME, JOOMLA_ADMIN_USER, JOOMLA_ADMIN_USERNAME, JOOMLA_ADMIN_PASSWORD, JOOMLA_ADMIN_EMAIL
  • JOOMLA_EXTENSIONS_URLS, JOOMLA_EXTENSIONS_PATHS
  • JOOMLA_SMTP_HOST, JOOMLA_SMTP_HOST_PORT
• Updated port mapping instructions to reflect the new network setup.
• Corrected the Dockerfile reference link for adding additional PHP extensions.

These changes improve the setup process, provide more flexible configuration options, and correct outdated references.