Migrate tags to single file

src/content.config.ts

@@ -1,5 +1,5 @@
 import { defineCollection, reference, z } from "astro:content";
-import { glob } from "astro/loaders";
+import { file, glob } from "astro/loaders";
 
 // Constants
 
@@ -359,11 +359,10 @@ const seriesCollection = defineCollection({
 });
 
 const tagCategoriesCollection = defineCollection({
-  loader: glob({ pattern: "*.{yml,yaml}", base: "./src/data/tag-categories" }),
+  loader: file("./src/data/tags.yaml"),
   schema: z.object({
     // Required parameters
-    name: z.string(),
-    index: z.number().int(),
+    category: z.string(),
     tags: z
       .array(
         z.object({