Makes the `start.sh` script executable by changing its permissions.
This ensures that the script can be run directly without needing to
explicitly call `sh start.sh`.
Adds file-saver and nanoid packages for file downloading and unique ID generation functionality.
These dependencies are essential for implementing a new feature that allows users to download generated data and ensure uniqueness across the application. The file-saver package provides the necessary tools to save files on the client-side, while nanoid generates unique IDs.