add TOC

next.config.mjs

@@ -2,10 +2,12 @@ import nextMDX from '@next/mdx'
 import { remarkPlugins } from './mdx/remark.mjs'
 import { rehypePlugins } from './mdx/rehype.mjs'
 import { recmaPlugins } from './mdx/recma.mjs'
+import rehypeSlug from "rehype-slug";
 
 const withMDX = nextMDX({
   options: {
     remarkPlugins,
+    // rehypeSlug,
     rehypePlugins,
     recmaPlugins,
     providerImportSource: '@mdx-js/react',