fix: remove unused instance property

Author: twlite

packages/commandkit/src/CommandKit.ts

@@ -9,7 +9,6 @@ import colors from './utils/colors';
 
 export class CommandKit {
   #data: CommandKitData;
-  static _instance: CommandKit | null = null;
 
   /**
    * Create a new command and event handler with CommandKit.
@@ -31,8 +30,7 @@ export class CommandKit {
     }
 
     this.#data = options;
-    CommandKit._instance = this;
-
+    
     this.#init();
   }