refactor guide pages to use content collections

also configuration->guide

src/content.config.ts

@@ -0,0 +1,11 @@
+import { defineCollection, z } from "astro:content";
+import { glob } from "astro/loaders";
+
+const guide = defineCollection({
+	loader: glob({ pattern: "**/*", base: "src/guide" }),
+	schema: z.object({
+		title: z.string(),
+	}),
+});
+
+export const collections = { guide };