Update neurips2021 categories

[KaiWaldrant]

Describe your changes

Update neurips 2021 datasets pages to update categories

Issue ticket number and link

Closes #xxxx (Replace xxxx with the GitHub issue number)

Checklist before requesting a review

• [x] I have performed a self-review of my code

• Check the correct box. Does this PR contain:

  • [ ] Breaking changes
  • [ ] New functionality
  • [ ] Major changes
  • [x] Minor changes
  • [ ] Bug fixes

• [x] Proposed changes are described in the CHANGELOG.md

• [ ] CI Preview succeeds and looks good!

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