Add canonical normalization vignette entry point

Author: OVVO-Financial

examples/vignettes/04_normalization_and_rescaling.py

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+"""Canonical vignette 04: Normalization and rescaling.
+
+Source of truth:
+    NNS/vignettes/NNSvignette_04_Normalization_and_Rescaling.Rmd
+
+The maintained implementation lives in ``normalization_rescaling.py``.
+"""
+from normalization_rescaling import main
+
+if __name__ == "__main__":
+    main()