[Snyk] Security upgrade gatsby from 2.18.18 to 2.31.0#16

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-e85ae1152ea8815831c570b457b92e2e

+7,831-3,726

Commits on Jan 20, 2021

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