Moved categories to its own configuration file

types/Item.ts

@@ -1,6 +1,8 @@
+import { Category } from "./Category";
+
 export type Item = {
 	timestamp: number;
-	category: 'home' | 'royal-road' | 'podcasts' | 'mixtapes';
+	category: Category;
 	title: string;
 	info: string;
 	link: string;