refactor: port site from Jekyll to Astro

src/content.config.ts

@@ -0,0 +1,12 @@
+import { defineCollection, z } from "astro:content";
+import { glob } from "astro/loaders";
+
+const spec = defineCollection({
+  loader: glob({ pattern: "**/*.md", base: "./src/content/spec" }),
+  schema: z.object({
+    title: z.string(),
+    version: z.string(),
+  }),
+});
+
+export const collections = { spec };