chore(deps): bump remark-math from 2.0.1 to 6.0.0 in /client

Bumps [remark-math](https://github.com/remarkjs/remark-math) from 2.0.1 to 6.0.0.
- [Release notes](https://github.com/remarkjs/remark-math/releases)
- [Commits](https://github.com/remarkjs/remark-math/compare/[email protected])

---
updated-dependencies:
- dependency-name: remark-math
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>