chore: import upstream snapshot with attribution

docs/lib/source.ts

@@ -0,0 +1,27 @@
+import { type InferPageType, loader } from 'fumadocs-core/source';
+import { lucideIconsPlugin } from 'fumadocs-core/source/lucide-icons';
+import { docs } from '@/.source';
+
+// See https://fumadocs.dev/docs/headless/source-api for more info
+export const source = loader({
+  baseUrl: '/',
+  source: docs.toFumadocsSource(),
+  plugins: [lucideIconsPlugin()],
+});
+
+export function getPageImage(page: InferPageType<typeof source>) {
+  const segments = [...page.slugs, 'image.png'];
+
+  return {
+    segments,
+    url: `/og/docs/${segments.join('/')}`,
+  };
+}
+
+export async function getLLMText(page: InferPageType<typeof source>) {
+  const processed = await page.data.getText('processed');
+
+  return `# ${page.data.title}
+
+${processed}`;
+}