fix: Update docs for a final publish before we move this package.

This is a part of openedx/axim-engineering#23

README.md

@@ -1,5 +1,10 @@
 # Paragon
 
+## Warning: Package Moved
+
+This package (`@edx/paragon`) will no longer receive updates at this location.
+The latest version can be found at https://www.npmjs.com/package/@openedx/paragon
+
 [![Build Status](https://github.com/openedx/paragon/actions/workflows/release.yml/badge.svg)](https://github.com/openedx/paragon/actions/workflows/release.yml)
 [![npm_version](https://img.shields.io/npm/v/@edx/paragon.svg)](@edx/paragon)
 ![status](https://img.shields.io/badge/status-Maintained-brightgreen)