chore(deps): bump axios, @docusaurus/core, @docusaurus/preset-classic and @docusaurus/theme-mermaid

Removes [axios](https://github.com/axios/axios). It's no longer used after updating ancestor dependencies [axios](https://github.com/axios/axios), [@docusaurus/core](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus), [@docusaurus/preset-classic](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus-preset-classic) and [@docusaurus/theme-mermaid](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus-theme-mermaid). These dependencies need to be updated together.


Removes `axios`

Updates `@docusaurus/core` from 2.4.3 to 3.8.1
- [Release notes](https://github.com/facebook/docusaurus/releases)
- [Changelog](https://github.com/facebook/docusaurus/blob/v3.8.1/CHANGELOG.md)
- [Commits](https://github.com/facebook/docusaurus/commits/v3.8.1/packages/docusaurus)

Updates `@docusaurus/preset-classic` from 2.4.3 to 3.8.1
- [Release notes](https://github.com/facebook/docusaurus/releases)
- [Changelog](https://github.com/facebook/docusaurus/blob/v3.8.1/CHANGELOG.md)
- [Commits](https://github.com/facebook/docusaurus/commits/v3.8.1/packages/docusaurus-preset-classic)

Updates `@docusaurus/theme-mermaid` from 2.4.3 to 3.8.1
- [Release notes](https://github.com/facebook/docusaurus/releases)
- [Changelog](https://github.com/facebook/docusaurus/blob/v3.8.1/CHANGELOG.md)
- [Commits](https://github.com/facebook/docusaurus/commits/v3.8.1/packages/docusaurus-theme-mermaid)

---
updated-dependencies:
- dependency-name: axios
  dependency-version: 
  dependency-type: indirect
- dependency-name: "@docusaurus/core"
  dependency-version: 3.8.1
  dependency-type: direct:production
- dependency-name: "@docusaurus/preset-classic"
  dependency-version: 3.8.1
  dependency-type: direct:production
- dependency-name: "@docusaurus/theme-mermaid"
  dependency-version: 3.8.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]