Pyqrlew

Changed
- Updated `qrlew-datasets`

Changed
- Remove data and db from pyqrlew. They are now in the qrlew-dataset package.
- The example notebook has been updated.

Added

- Changelog file

Fixed

- Automated Postgresql setup if not already the case

Changed

- Upgrade dependencies: Ruby 3.2.1, Middleman, etc.

Removed

- Cleaned the test environment