Add remark-mdx-remove-esm to MDX extensions list (#2675)

Author: talatkuyuk

docs/docs/extending-mdx.mdx

@@ -105,6 +105,8 @@ See also the [list of remark plugins][remark-plugins],
   — change frontmatter (YAML) metadata to exports
 * [`goodproblems/remark-mdx-math-enhanced`](https://github.com/goodproblems/remark-mdx-math-enhanced)
   — enhance math with JavaScript inside it
+* [`ipikuka/remark-mdx-remove-esm`](https://github.com/ipikuka/remark-mdx-remove-esm)
+  — remove import and/or export statements (mdxjsEsm)
 
 {/*
   * Please use alpha sorting on **project** name!