Bump trim, @docusaurus/core and @docusaurus/preset-classic in /docs

Removes [trim](https://github.com/Trott/trim). It's no longer used after updating ancestor dependencies [trim](https://github.com/Trott/trim), [@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 `trim`

Updates `@docusaurus/core` from 2.3.1 to 3.1.0
- [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/v3.1.0/packages/docusaurus)

Updates `@docusaurus/preset-classic` from 2.0.0-alpha.55 to 3.1.0
- [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/v3.1.0/packages/docusaurus-preset-classic)

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

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