Bump prismjs from 1.15.0 to 1.25.0 in /docs/website

Bumps [prismjs](https://github.com/PrismJS/prism) from 1.15.0 to 1.25.0.
- [Release notes](https://github.com/PrismJS/prism/releases)
- [Changelog](https://github.com/PrismJS/prism/blob/master/CHANGELOG.md)
- [Commits](PrismJS/prism@v1.15.0...v1.25.0)

---
updated-dependencies:
- dependency-name: prismjs
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>