Implementing https://github.com/coreyward/gatsby-plugin-sanity-image
- https://hangindev.com/blog/create-a-custom-figure-block-in-sanity-that-supports-lazy-loading-effect
- https://gist.github.com/kmelve/e047d40e24d92f1b4751535a4cee1e59
- https://www.apostrof.co/blog/svelte-sanity-responsive-lazy-loaded-jank-free-images/
- https://www.sanity.io/docs/image-type#custom-asset-sources-495696608224