[`remark@14`](https://github.com/remarkjs/remark/releases/tag/14.0.0) has been supported only ESM.
So, this package needs to become ESM to bump up `remark` dependencies.

Here are the installation commands:

```shell
npm install \
  remark-cli@latest \
  remark-frontmatter@latest \
  remark-preset-lint-recommended@latest \
  remark-preset-prettier@latest \
  remark-validate-links@latest

npm install 'github:stylelint/eslint-config-stylelint#esm'
```

Note that this change needs the ESLint configuration for ESM.
See <stylelint/eslint-config-stylelint#133>