Accessibility: Caption for horizontal row widget not associated with the image

See the markup for the image on this exhibit page: https://exhibits.stanford.edu/stanford-aapi/feature/timeline, which shows that the caption is NOT associated with the image. This is incorrect for accessibility.

Stanford Office of Digital Accessibility review of Exhibits, Stanford's Spotlight instance.

Create content on a home, feature, or about page using the horizontal row widget. Make sure to create a caption.

We should also check all of the widgets that allow captions to see if the same problem is present.

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