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/mdx-components.tsx

@@ -0,0 +1,39 @@
+import defaultMdxComponents from 'fumadocs-ui/mdx';
+import type { MDXComponents } from 'mdx/types';
+import {
+  Frame,
+  CardGroup,
+  MintlifyCard,
+  Steps,
+  Step,
+  Tip,
+  Note,
+  Warning,
+  Info,
+  Danger,
+  AccordionGroup,
+  Accordion,
+} from '@/components/mintlify-compat';
+import { APIPage } from '@/components/api-page';
+
+export function getMDXComponents(components?: MDXComponents): MDXComponents {
+  return {
+    ...defaultMdxComponents,
+    // Mintlify compatibility components
+    Frame,
+    CardGroup,
+    Card: MintlifyCard,
+    Steps,
+    Step,
+    Tip,
+    Note,
+    Warning,
+    Info,
+    Danger,
+    AccordionGroup,
+    Accordion,
+    // OpenAPI component
+    APIPage,
+    ...components,
+  };
+}