Revert "DEV: Deprecate the plugin (#382)" (#383)

This reverts commit 0ab4002.

Author: CvX

README.md

@@ -1,8 +1,5 @@
 ## Discourse Solved
 
-> [!IMPORTANT]
-> This plugin has now been bundled into Discourse core. See: https://meta.discourse.org/t/bundling-more-popular-plugins-with-discourse-core/373574
-
 Provides a solved button on designated categories
 
 ## How to Install this Plugin