full stack proxy nginx slim v2.2.0

• added package manager systems support
• added linux os support
• added database(mariadb, mysql) option
• fixed some minor errors
• improved some codes and syntaxes
• upgraded to docker compose version 2.23.3
• added error handlers
• updated PhpMyAdmin image tag
• added certbot image version tag
• added healthcheck to the slim, certbot and database services
• removed sub directory "webapp"