add full support and examples for toggle controller

src/Alex2Node.ts

@@ -135,17 +135,17 @@ class Alex2MQTT extends EventEmitter {
     }
     const normalizedCategory =
       displayCategory === null
-        ? null
+        ? [DisplayCategory.LIGHT]
         : Array.isArray(displayCategory)
         ? displayCategory
-        : [displayCategory];
+        : [displayCategory||DisplayCategory.LIGHT];
 
     const device = new Device(
       this.client!,
       this.rootTopic,
       name,
       endpointId,
-      normalizedCategory|| [DisplayCategory.LIGHT]
+      normalizedCategory
     );
     this.devices.push(device);
     return device;