Bump ejs and docz in /docs

Removes [ejs](https://github.com/mde/ejs). It's no longer used after updating ancestor dependency [docz](https://github.com/doczjs/docz/tree/HEAD/core/docz). These dependencies need to be updated together.


Removes `ejs`

Updates `docz` from 1.2.0 to 2.4.0
- [Release notes](https://github.com/doczjs/docz/releases)
- [Changelog](https://github.com/doczjs/docz/blob/main/core/docz/CHANGELOG.md)
- [Commits](https://github.com/doczjs/docz/commits/v2.4.0/core/docz)

---
updated-dependencies:
- dependency-name: ejs
  dependency-version: 
  dependency-type: indirect
- dependency-name: docz
  dependency-version: 2.4.0
  dependency-type: direct:production
...

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Author: dependabot[bot]