feat: don't upscale images (#441)

* feat: don't upscale images

* feat: add image to demo

* chore: add image credit

Author: ascorbic

Diff for: demo/pages/image.js

@@ -0,0 +1,17 @@
+import Image from 'next/image'
+import img from './unsplash.jpg'
+
+const Images = () => (
+  <div>
+    <Image src={img} width={1200} height={800} alt="shiba inu dog looks through a window" />
+    <p>
+      <a href="https://unsplash.com/photos/DVCyb0lssMk">Photo</a> by{' '}
+      <a href="https://unsplash.com/@veraduez?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">
+        Vera Duez
+      </a>{' '}
+      on <a href="https://unsplash.com/?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Unsplash</a>
+    </p>
+  </div>
+)
+
+export default Images