Add deprecation notices to all packages

Author: jesstelford

README.md

@@ -1,5 +1,13 @@
 # quilt_rails
 
+> [!CAUTION]
+>
+> `quilt_rails` is deprecated.
+>
+> Shopifolk, see
+> [Shopify/quilt-internal](https://github.com/shopify/quilt-internal) for
+> information on the latest packages available for use internally.
+
 A turn-key solution for integrating [Quilt](https://github.com/Shopify/quilt) client-side libraries into your Rails app, with support for server-side-rendering using [`@shopify/react-server`](https://www.npmjs.com/package/@shopify/react-server), integration with [`@shopify/sewing-kit`](https://github.com/Shopify/sewing-kit) for building, testing and linting, and front-end performance tracking through [`@shopify/performance`](https://www.npmjs.com/package/@shopify/performance).
 
 ## Table of Contents