Lazily load viewer thumbnails #240
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react-lazy-load-image-componentand modifiessrc/components/Viewer/Media/Thumbnail.tsxto use it. I don't know anything about the source of the code other than it seems popular. Lazy loading was requested in issue #86.Tested on a ~1200 page manifest ( https://collections.library.yale.edu/manifests/30675510 ) and performance seemed good on Mac Safari, Chrome, and Firefox. Could use further real-world testing on mobile devices.