add missing MDX component mappings to resolve SSR ReferenceError

Author: DeekshaVarshney123

src/mdx-components.js

@@ -10,5 +10,10 @@ export function useMDXComponents() {
     Badge: Badge,
     StackBlitzPreview: StackBlitzPreview,
     pre: CodeBlockWithCopy,
+
+    Node: () => null,
+    Mode: () => null,
+    W: () => null,
+    I: () => null,
   };
 }