removes default content-visibility styles from image components (#5180)

.changeset/chilly-experts-add.md

@@ -0,0 +1,9 @@
+---
+'@astrojs/image': minor
+---
+
+Removes the `content-visibility: auto` styling added by the `<Picture />` and `<Image />` components.
+
+**Why:** The [content-visibility](https://developer.mozilla.org/en-US/docs/Web/CSS/content-visibility) style is rarely needed for an `<img>` and can actually break certain layouts.
+
+**Migration:** Do images in your layout actually depend on `content-visibility`?  No problem!  You can add these styles where needed in your own component styles.