Add initial setup for Fumadocs documentation migration

- Created new directory structure for documentation under `/docs2`.
- Added `.gitignore` to exclude build artifacts and dependencies.
- Introduced `package.json`, `next.config.mjs`, and `postcss.config.mjs` for project configuration.
- Implemented MDX components in `mdx-components.tsx` for rendering documentation.
- Migrated existing documentation content and created new files for auto-updater and other features.
- Established compatibility layer for Mintlify components in `mintlify-compat.tsx`.
- Set up OpenAPI documentation in `openapi.json`.
- Updated README and migration guide to reflect new structure and usage instructions.
- Ensured all components and pages are ready for development and deployment with Fumadocs.

docs2/lib/source.ts

@@ -0,0 +1,27 @@
+import { docs } from '@/.source';
+import { type InferPageType, loader } from 'fumadocs-core/source';
+import { lucideIconsPlugin } from 'fumadocs-core/source/lucide-icons';
+
+// See https://fumadocs.dev/docs/headless/source-api for more info
+export const source = loader({
+  baseUrl: '/docs',
+  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}`;
+}