Blur-up image loading with next/image

I wanted to implement Medium's progressive image loading technique with Next.js's new
component. It doesn't pass the image dimensions, not as intuitive as gatsby.
Found a way to make it work for article images and book covers. Using next-placeholder to get
during the build time, then passing it to blurhash.
Unfortunately non-meta images are still lacking this feature. Generating a map of blurhashes of each local image could be a solution. It's a bit ugly though.

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