0.18.2 — say what a PRD is, with an example

Changed

• What a PRD is, in plain words. The start card explains it — a one-page description of the product: what it is for, who uses it, what it does; ANA builds the screens from it — with an example (Studio sales). Talk to ANA's first message does the same in one or two sentences before asking "What product do you want to make?".

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