feat: define blog schema and add blog collection

src/content/_schemas.ts

@@ -2,9 +2,9 @@ import { z } from "astro:content";
 
 export const blogSchema = z.object({
   author: z.string(),
-  publishDatetime: z.string(), // z.string().datetime() only available in Zod v3.20.2
+  pubDatetime: z.date(), // z.string().datetime() only available in Zod v3.20.2
   title: z.string(),
-  slug: z.string().optional(),
+  postSlug: z.string().optional(),
   featured: z.boolean(),
   draft: z.boolean(),
   tags: z.array(z.string()),

src/content/config.ts

@@ -1,5 +1,5 @@
 import { defineCollection } from "astro:content";
-import { blogSchema } from "./schemas";
+import { blogSchema } from "./_schemas";
 
 const blogCollection = defineCollection({
   schema: blogSchema,