add carbon rating

src/content/config.ts

@@ -1,11 +1,10 @@
 import { z, defineCollection } from 'astro:content';
-import { Tag } from 'src/types';
 
 const blogCollection = defineCollection({
 	schema: z.object({
 		title: z.string(),
 		pubDate: z.string().transform((str: string) => new Date(str)),
-		tags: z.array(z.nativeEnum(Tag)),
+		tags: z.array(z.string()),
 	}),
 });