fix: improve mdx code block pipeline

next.config.ts

@@ -1,6 +1,8 @@
 import type { NextConfig } from 'next'
 import createMDX from '@next/mdx'
 
+const mdxCodeBlockPipeline = new URL('./lib/mdx-hast-visitor.js', import.meta.url).pathname
+
 const nextConfig: NextConfig = {
   output: 'export',
   trailingSlash: true,
@@ -14,8 +16,7 @@ const withMDX = createMDX({
       'rehype-slug',
       ['rehype-external-links', { target: '_blank', rel: ['nofollow', 'noopener', 'noreferrer'] }],
       'rehype-autolink-headings',
-      ['rehype-pretty-code', { theme: { light: 'github-light', dark: 'github-dark-dimmed' }, keepBackground: false, grid: true }],
-      '/mnt/blog/new-blog/lib/mdx-hast-visitor.js',
+      mdxCodeBlockPipeline,
       'rehype-katex',
     ],
   },