* Add Sprites integration
Adds the Sprites integration page and catalog icon. Sprites (https://sprites.dev)
are persistent, stateful Linux sandboxes from Fly.io with checkpoint/restore,
via the sprites-adk plugin (pip install sprites-adk).
* Refine Sprites page: benefit-forward use cases, precise wording
* Address review: functional heading + runner registration in example
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Co-authored-by: Kristopher Overholt <koverholt@google.com>
Alex Ezell