docs: fix dataset links to correct HF namespace and split Kaggle URLs… #304

Job	Run time
Validate lead scoring dataset	36s
Tests (Python 3.11)	2m 57s
Release artifacts in sync (PR 7.2.1)	44s
Tests (Python 3.12)	2m 58s
Execute release notebooks (G13.1)	1m 24s
Type check	46s
Validate v6 lead scoring dataset	40s
Lint & format	9s
Validate v7 lead scoring dataset	32s
	10m 46s

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