build(deps): bump d3-color and gatsby-remark-mermaid in /docs

Bumps [d3-color](https://github.com/d3/d3-color) to 3.1.0 and updates ancestor dependency [gatsby-remark-mermaid](https://github.com/remcohaszing/gatsby-remark-mermaid). These dependencies need to be updated together.


Updates `d3-color` from 1.4.1 to 3.1.0
- [Release notes](https://github.com/d3/d3-color/releases)
- [Commits](d3/d3-color@v1.4.1...v3.1.0)

Updates `gatsby-remark-mermaid` from 2.1.0 to 3.0.1
- [Release notes](https://github.com/remcohaszing/gatsby-remark-mermaid/releases)
- [Commits](remcohaszing/gatsby-remark-mermaid@v2.1.0...v3.0.1)

---
updated-dependencies:
- dependency-name: d3-color
  dependency-type: indirect
- dependency-name: gatsby-remark-mermaid
  dependency-type: direct:production
...

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