Replaces SETUP_COMPLETED variable with a database setting. Changes setup to add the setting to the database. Also adds a migration for existing installations.
- 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
- 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
