Link to Registry of Image Extensions is broken #899
Description
On https://iiif.io/api/registry/ the link below "Image API Registries" is broken, it should certainly point to https://iiif.io/api/registry/image-extensions/
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On https://iiif.io/api/registry/ the link below "Image API Registries" is broken, it should certainly point to https://iiif.io/api/registry/image-extensions/