Worldtally US state flag sprite
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The file `us-state-flags.webp` is a rendered sprite of the 50 US state flags plus
the District of Columbia, in the order of the state list in `public/us-states.js`.

Source images: nibsbin/us-state-flags-svg (github.com/nibsbin/us-state-flags-svg),
whose README states that the images were pulled from public-domain flag images on
Wikimedia Commons. The sprite is used here as a public-domain visual asset.