Docs: Rendering Breadcrumbs

[manuelroemer]

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Description

Documents how breadcrumbs can be rendered from an app shell and from pilets, respectively. I think this is not yet described anywhere. The only location where I found some details about how to render breadcrumbs, from pilets specifically, were in this chat message.

Remarks

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[FlorianRappl]

LGTM - only improvement is to make this a bit more generic.

[FlorianRappl]

Great one - thanks!