Bump axios, @docusaurus/core and @docusaurus/preset-classic

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) and [@docusaurus/preset-classic](https://github.com/facebook/docusaurus/tree/HEAD/packages/docusaurus-preset-classic). These dependencies need to be updated together.


Removes `axios`

Updates `@docusaurus/core` from 2.0.0-beta.ff31de0ff to 3.4.0
- [Release notes](https://github.com/facebook/docusaurus/releases)
- [Changelog](https://github.com/facebook/docusaurus/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/docusaurus/commits/v3.4.0/packages/docusaurus)

Updates `@docusaurus/preset-classic` from 2.0.0-beta.ff31de0ff to 3.4.0
- [Release notes](https://github.com/facebook/docusaurus/releases)
- [Changelog](https://github.com/facebook/docusaurus/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/docusaurus/commits/v3.4.0/packages/docusaurus-preset-classic)

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

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Author: dependabot[bot]