fix: remove filterMetaString callback from rehypePrettyCode config

next.config.ts

@@ -7,7 +7,6 @@ import rehypeSlug from 'rehype-slug'
 import rehypeExternalLinks from 'rehype-external-links'
 import rehypeAutolinkHeadings from 'rehype-autolink-headings'
 import rehypePrettyCode from 'rehype-pretty-code'
-import { transformerCopyButton } from '@rehype-pretty/transformers'
 import rehypeKatex from 'rehype-katex'
 
 const nextConfig: NextConfig = {
@@ -28,9 +27,6 @@ const withMDX = createMDX({
         keepBackground: false,
         lineNumbers: true,
         grid: true,
-        transformers: [
-          transformerCopyButton({ visibility: 'hover', feedbackDuration: 2500 }),
-        ],
       }],
       rehypeKatex,
     ],