When we first implemented lazy loading using the `vanilla-lazyload` the native support in browsers for the `loading` html attribute was pretty low. Now things look better for the 3 major browsers.

On top of that, Wordpress 5.5 (planned to be released at Aug 11) will have builtin support for `loading` with `lazy` being the default option.

Readings

• Native image lazy-loading

Tasks

• Remove custom loading code from the blocks and sections that have it (Carousel Header, Articles, Search results).
• Add loading="lazy" to all the above cases.
• Remove custom loading code from Image block. Don't add something custom to check if WP is adding its own loading attribute here after 5.5