[Snyk] Security upgrade gatsby from 2.18.18 to 3.13.0#20

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-082326826ba8af49c5fa609e41b7834c

+10,129-6,538

Commits on Sep 1, 2021

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