chore(docs): mention behavior of redirects and remotePatterns (#91151)
Some users have been confused by the relationship of
`images.remotePatterns` and `images.maximumRedirects` so lets document
it.
This behavior is expected since you might allowlist something like
`https://github.com/styfle.png` and that can redirect to whatever it
needs to redirect to (assuming maximumRedirects > 0). For example, it
currently redirects to
`https://avatars.githubusercontent.com/u/229881?v=4` but you can imagine
in the future if the redirect was changed, you wouldn't want your app to
break.
Regardless of redirects, the final response must be an image.
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Co-authored-by: Zack Tanner <1939140+ztanner@users.noreply.github.com>