docs(README): add deprecation note

Author: caugner

README.md

@@ -1,12 +1,9 @@
-# interactive-examples
+# interactive-examples (deprecated)
 
-> [!WARNING]
-> This repository is in the process of being **archived**!
+> [!IMPORTANT]
+> As of March 2025, all interactive examples have been moved into content, see <https://github.com/orgs/mdn/discussions/782>.
 >
-> New pull requests will be closed, so do not work on issues or tasks relating to this repository to avoid lost time and work.
-> For more information, see <https://github.com/orgs/mdn/discussions/782>.
-
-[![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)
+> This repository was archived in October 2025, and is now **read-only**, see <https://github.com/orgs/mdn/discussions/841>.
 
 Home of the [MDN](https://developer.mozilla.org/) interactive code examples.