Update [[...slug]].mdx (#380)

Author: Dimitri POSTOLOV

website/pages/en/substreams/[[...slug]].mdx

@@ -39,11 +39,6 @@ export async function getStaticProps({ params: { slug = ['README'] } }) {
     .replaceAll(/{%.*?%}/g, '')
     // close img tags only if he doesn't point to .gitbook
     .replaceAll(/<img(.*?)>/g, (...m) => (m[1].includes('src=".gitbook') ? '' : `<img${m[1]}/>`))
-    // fixes http://localhost:3000/en/substreams/reference-and-specs/authentication/
-    .replaceAll('<pre class="language-bash" data-overflow="wrap"><code class="lang-bash">', '```bash\n')
-    // fixes http://localhost:3000/en/substreams/developers-guide/modules/inputs/
-    .replaceAll('<pre class="language-yaml" data-title="manifest excerpt"><code class="lang-yaml">', '```yaml\n')
-    .replaceAll('</code></pre>', '```')
   const mdx = await buildDynamicMDX(data, {
     mdxOptions: {
       // change-log contains `{variable}` text that is thrown an error by MDX2 parser since he treat it as variable injection, to fix it we parse chang-log with the markdown parser