replace custom Menu class with moinframe/kirby-panel-menu plugin

Author: tobimori

composer.json

@@ -33,15 +33,13 @@
 		"lukaskleinschmidt/kirby-types": "^2.0",
 		"tobimori/kirby-trawl": "^1.0",
 		"tobimori/kirby-queues": "^1.0@beta",
-		"spatie/schema-org": "^4.0"
+		"spatie/schema-org": "^4.0",
+		"moinframe/kirby-panel-menu": "^1.0"
 	},
 	"autoload": {
 		"files": [
 			"site/plugins/extended/helpers.php"
-		],
-		"psr-4": {
-			"Plugin\\": "site/plugins/extended/classes/"
-		}
+		]
 	},
 	"extra": {
 		"kirby-cms-path": false