chore: remove unused dependency rimraf

[fasttime]

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What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[ ] Bug fix (template)
[ ] New rule (template)
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[X] Other, please explain:

Remove an unused dependency.

What changes did you make? (Give an overview)

This PR removes rimraf as a dev dependency from docs/package.json.

I noticed that rimraf is showing up on the Renovate dashboard as pending update, but it's apparently not used anywhere.

Feel free to close this PR if rimraf is still being used in a way that I haven't considered.

Is there anything you'd like reviewers to focus on?

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[snitin315]

Good catch. I see that it was added in #15815, but don't see it being used anywhere.

I'll leave it open for others to review.

[mdjermanovic]

LGTM, thanks!