Change php version to php-8.3 as default since we now build multiple php versions

Update README.md

Set default basic auth credentials

Update traefik subnet on main docker install as well

Set default traefik subnet, otherwise nginx exits

Simplify volumes

Update .env

Update README.md

Create .env

Update README.md

Update README.md

Update docs to reflect addition of post install script

Update values table

Update documentation to reflect recent changes

Optimize, clean up and comments