DEV: Mention the core move in readme (#1514)

Author: CvX

README.md

@@ -1,15 +1,18 @@
 # **Discourse AI** Plugin
 
+> [!IMPORTANT]
+> This plugin has now been bundled into Discourse core. See: https://meta.discourse.org/t/bundling-more-popular-plugins-with-discourse-core/373574
+
 **Plugin Summary**
 
 For more information, please see: https://meta.discourse.org/t/discourse-ai/259214?u=falco
 
 ### Evals
 
-The directory `evals` contains AI evals for the Discourse AI plugin. 
+The directory `evals` contains AI evals for the Discourse AI plugin.
 You may create a local config by copying `config/eval-llms.yml` to `config/eval-llms.local.yml` and modifying the values.
 
-To run them use: 
+To run them use:
 
 cd evals
 ./run --help