update to nextra 4

mdx-components.ts

@@ -0,0 +1,12 @@
+import { useMDXComponents as getThemeComponents } from "nextra-theme-docs"; // nextra-theme-blog or your custom theme
+
+// Get the default MDX components
+const themeComponents = getThemeComponents();
+
+// Merge components
+export function useMDXComponents(components = {}) {
+  return {
+    ...themeComponents,
+    ...components,
+  };
+}