Adds deprecation warning to readme

Leee-xx · Leee-xx · commit c9a0d1cf605f · 2023-02-22T15:49:38.000-08:00
diff --git a/README.md b/README.md
@@ -1,3 +1,9 @@
+# DEPRECATION WARNING
+This repo is deprecated in favor of the private
+[github_actions](https://github.com/tedconf/github_actions) repo. Please refer
+to the documentation therein. All development should now be forked from that
+repo.
+
 # github_actions_public
 
 This repository holds reusable Github Action workflows as well as example
