Improve Docker deployment script

[enzo-g]

Hi! I've been testing your software and encountered some
challenges during the initial setup process. I'd like to
contribute by improving the quick setup script - here's my Pull
Request.

Changes Made:

I've enhanced the script to properly configure domains and ports
in appsettings.json based on the chosen deployment scenario
(direct access, reverse proxy, or lab environment without HTTPS).

Additionally, I've implemented several security and usability
improvements:

• Modified Docker port exposure to bind to 127.0.0.1 instead of
  all interfaces for reverse proxy deployments, preventing direct
  internet access on VPS services without security groups
• Removed MySQL port exposure as external access isn't required
• Changed the default installation directory to /opt/netlockrmm
  for better system organization
• Replaced hardcoded paths in docker-compose with relative paths
  for improved portability

Summary:

• Ensure domains and ports in appsettings.json are configured
  according to deployment type
• Update README with new installation steps using
  NetLock-docker-quick-deployment/
• Streamline setup process to make NetLock RMM immediately ready
  for use after deployment

[0x100001]

Will be reviewed with next release. Thank you in advance!