[Snyk] Security upgrade gatsby from 2.13.73 to 3.13.0#44

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-b39653ab131462774af863af8f3e7750

+11,796-6,461

Commits on Sep 13, 2021

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