pidigits example website is gone

super-computing.org now redirects to https://datascienceparichay.com/super-computing/ which seems a bit sketchy. Let's find another source for the pi digits dataset.

Inspect the pidigits example to locate its reference to super-computing.org, then verify a trustworthy replacement source for the pi digits dataset. Done means the example no longer points to the unavailable website and the replacement dataset is suitable for the example.

Vom Indexierungsmodell aus dem Issue-Text verfasst.