The following command will crawl the conferences from `https://www.dm.unipi.it/research/past-conferences/` (pages 1 to 5) and save the results in `conferences.json`:
The following command will crawl all the conferences from `https://www.dm.unipi.it/research/past-conferences/` (all pages) and save the results in `conferences.json` as a list of json objects, one per line.