Add screenshot carousel to docs landing page

[kmcginnes]

Add a screenshot carousel (image slideshow) to the Starlight documentation landing page so visitors can immediately see what Graph Explorer looks like before diving into the docs. Carousel should display representative screenshots of Graph Explorer (graph view, table view, connections panel, etc.) and be responsive, accessible, and auto-playing with manual navigation controls.

Related Issues

• Part of Migrate documentation to Starlight (Astro) #1754

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