refactor: docubook@latest template nextjs-docker

lib/mdx/index.ts

@@ -0,0 +1,11 @@
+import type { MdxComponentMap } from "@docubook/mdx-content";
+import Outlet from "@/lib/mdx/Outlet";
+// import your custom MDX components here and add them to the `customMdxComponents` object below to make them available in your MDX files. For example:
+// import { MyCustomComponent } from "@/lib/mdx/MyCustomComponent";
+
+export const customMdxComponents: MdxComponentMap = {
+    Outlet,
+    // MyCustomComponent, --- IGNORE ---
+};
+
+// you must also add MyCustomComponent.tsx to lib/mdx/MyCustomComponent.tsx and export it from there, and then export it from this file as well to make it available for import in mdx-components.ts.