docs: Reference to statically imported images

[icyJoseph]

Closes: https://linear.app/vercel/issue/DOC-4730/docs-nextimage-local-images-broken-snippet
Fixes: #80023

Made the static image imports, into a sub section of local images, and referenced how their width/height is auto calculated.

• next.js/packages/next/src/shared/lib/get-img-props.ts

  Lines 397 to 398 in fde4f7f

  	widthInt = staticImageData.width
  	heightInt = staticImageData.height

  here we copy the dimensions for statically imported images

There's also some tests that reference this usage:

• next.js/test/integration/next-image-new/base-path/pages/static-img.js

  Line 23 in 00c52d1

  <Image id="basic-static" src={testImg} placeholder="blur" priority />

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