Bump prismjs from 1.22.0 to 1.23.0 in /website

Bumps [prismjs](https://github.com/PrismJS/prism) from 1.22.0 to 1.23.0.
- [Release notes](https://github.com/PrismJS/prism/releases)
- [Changelog](https://github.com/PrismJS/prism/blob/master/CHANGELOG.md)
- [Commits](PrismJS/prism@v1.22.0...v1.23.0)

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