New blueprint_stocks example that uses visible time ranges

[jleibs]

What

This example is a bit harder to follow than the original, which served as a better first-blueprint example. Instead introduced a new example since the structure of the logged data is different.

TODO

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[github-actions]

Deployed docs

Commit	Link
639cb48	https://landing-c39k3q3lj-rerun.vercel.app/docs

[Wumpf]

@jleibs what are your thoughts on this, do you still want this second variant of the example?