- Specify registries in Dockerfiles such that Podman can resolve the dependencies
- Add a name for the PHP container, such that the commands work when using `exec -it linkace-php`
- Mention in CONTRIBUTING.md that Podman works also
- Update the PHP version in CONTRIBUTING.md as proposed in https://github.com/Kovah/LinkAce/discussions/746#discussioncomment-9101259
- Adds new Dockerfile for unified PHP-nginx container
- Adds new configuration files for simple setup with unified container
- Removes Redis from simple setup
- Changes default cache and session driver form Redis to file
- Updates nginx configuration accordingly
