build(deps): bump dompurify and docsify-server-renderer in /docs (#737)

Removes [dompurify](https://github.com/cure53/DOMPurify). It's no longer used after updating ancestor dependency [docsify-server-renderer](https://github.com/docsifyjs/docsify). These dependencies need to be updated together.


Removes `dompurify`

Updates `docsify-server-renderer` from 4.12.2 to 4.13.1
- [Release notes](https://github.com/docsifyjs/docsify/releases)
- [Changelog](https://github.com/docsifyjs/docsify/blob/v4.13.1/CHANGELOG.md)
- [Commits](docsifyjs/docsify@v4.12.2...v4.13.1)

---
updated-dependencies:
- dependency-name: dompurify
  dependency-type: indirect
- dependency-name: docsify-server-renderer
  dependency-type: indirect
...

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