Update README to mark repository as abandoned

Indicate that the repository is abandoned and provide a link to the new version.

Author: carlosevia

README.md

@@ -1,4 +1,8 @@
-# 📘 DITA-OT Publishing with GitHub Actions
+# 📘 DITA-OT Publishing with GitHub Actions (Abandoned)
+
+ **This repository is no longer updated.**
+ A new version of this template is at [https://github.com/VT-Evia/DITA-OT-GH-Actions](https://github.com/VT-Evia/DITA-OT-GH-Actions).
+ 
 
 Template repository for publishing **Bootstrap-themed HTML** and **PDF** outputs using [DITA-OT build GitHub Action](https://github.com/dita-ot/dita-ot-action).