chore: remove dependabot from upgrading npm dependencies

[Josh-Cena]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

I'm now doing weekly dependency upgrades myself, there's no need to continue using dependabot. It's still nice to upgrade GitHub actions, but for npm it's too much noise.

[netlify]

✅ [V2]

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[github-actions]

⚡️ Lighthouse report for the changes in this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
https://deploy-preview-7322--docusaurus-2.netlify.app/	🟠 68	🟢 100	🟢 92	🟢 100	🟢 90	View report
https://deploy-preview-7322--docusaurus-2.netlify.app/docs/	🟠 68	🟢 94	🟢 92	🟢 90	🟢 90	View report