✨ Major Changes

• #9271 47604bd5b Thanks @matthewp! - Renames Dev Overlay to Dev Toolbar

  The previously named experimental Dev Overlay is now known as the Astro Dev Toolbar. Plugins have been renamed as Toolbar Apps. This updates our references to reflect.

  To not break existing APIs, aliases for the Toolbar-based names have been created. The previous API names will continue to function but will be deprecated in the future. All documentation has been updated to reflect Toolbar-based names.