To minimise first-time user friction, add instructions for uv to `getting started` docs

[dbrtly]

What's the issue or suggestion?

As discussed with Pedram, politely suggest that leveraging uv in "Getting started" could provide an option to reduce friction when onboarding by eliminating the "basic Python knowledge" and taking responsibility for installing Python and managing virtual environments. Proactive action to simplify the experience of getting started with Dagster.

Additional information

No response

Message from the maintainers

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[garethbrickman]

Pending on #24987

[dbrtly]

For clarity, I was hoping to contribute to the docs update.