DEV: Deprecate the plugin (#246)

Author: cvx

README.md

@@ -1,5 +1,8 @@
 ## Discourse Topic Voting
 
+> [!IMPORTANT]
+> This plugin has now been bundled into Discourse core. See: https://meta.discourse.org/t/bundling-more-popular-plugins-with-discourse-core/373574
+
 Adds the ability for voting on a topic within a specified category.
 
 Topic discussing the plugin itself can be found here: [https://meta.discourse.org/t/discourse-voting/40121](https://meta.discourse.org/t/discourse-voting/40121?u=joebuhlig)