Fix pretrained weights checkpoint_path and inference weight double double download

[tlarcher]

📝 Changelog

Main changes

• Updated all examples to fix inference path issue. Previously, PyTorch Lightning overwrote checkpoint_paths with the values contained in the saved checkpoint files. However, those provided by the Malpolon team for pure inference purposes, contained absolute path incompatible with other people's machines. Now, only relative paths are stored.
• Updated all examples to prevent downloading the model weights twice when running models in inference mode
• Updated URL and md5 checksum signature to download glc24_pre_extracted pre-trained weights

Other changes

• Added Malpolon QR code in project resources

🔗 Links

• 🔗 Fix pretrained weights checkpoint_path and inference weight double download #74

✅ Checklist

• Lint and tests pass locally with my changes
• I've added necessary documentation