build(deps): bump prismjs from 1.17.1 to 1.21.0 in /docs/website

Bumps [prismjs](https://github.com/PrismJS/prism) from 1.17.1 to 1.21.0.
- [Release notes](https://github.com/PrismJS/prism/releases)
- [Changelog](https://github.com/PrismJS/prism/blob/master/CHANGELOG.md)
- [Commits](PrismJS/prism@v1.17.1...v1.21.0)

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