[Snyk] Security upgrade gatsby from 2.18.18 to 4.0.0#39

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-23ba16057c69463d93300dd98c426895

+10,019-6,664

Commits on Jan 25, 2022

fix: deps/npm/docs/package.json & deps/npm/docs/package-lock.json to reduce vulnerabilities
snyk-bot
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