- Upgrades the Dockerfiles and composer.json to require PHP 8.
- Upgrades to Laravel 9 with all needed changes.
- Move lang folder to root directory.
- Upgrades third-party packages to the latest versions with all required changes.
- Removes all config values that are not really needed for the most basic setup
- Adds a generic standard value for the app key which is checked in the setup middleware and replaced with a secure, random key then