feat(llms): Add Markdown format content export feature

src/pages/llms.txt.js

@@ -0,0 +1,42 @@
+import { getCollection } from "astro:content";
+import { siteConfig } from "../config";
+
+// Modified version that outputs markdown content
+export async function GET(context) {
+  let baseUrl = context.site?.href || "https://terminal-blog.example.com";
+  if (baseUrl.at(-1) === "/") baseUrl = baseUrl.slice(0, -1);
+  const markdownText = `# ${siteConfig.title}
+
+> ${siteConfig.description}
+
+${await generateMarkdownSection("posts", "Post", baseUrl)}
+
+${await generateMarkdownSection("pages", "Page", baseUrl)}`;
+
+  return new Response(markdownText);
+}
+
+async function generateMarkdownSection(collectionName, sectionTitle, baseUrl) {
+  const items = await getCollection(collectionName);
+
+  // Sort posts by pubDate if available
+  const sortedItems =
+    collectionName === "posts"
+      ? items.sort((a, b) => (a.data.pubDate > b.data.pubDate ? -1 : 1))
+      : items;
+
+  let markdown = `## ${sectionTitle}\n`;
+
+  for (const item of sortedItems) {
+    const { title, description, slug } = getMetaData(item);
+    markdown += `\n- [${title}](${baseUrl}/post/${slug}): ${description}`;
+  }
+
+  return markdown;
+}
+
+function getMetaData(collection) {
+  const { title, description } = collection.data;
+  const { slug } = collection;
+  return { title, description, slug };
+}