[Snyk] Security upgrade gatsby from 2.18.18 to 3.13.0#44

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-011c18268d2ca44695595951e525142b

+10,150-6,542

Commits on Sep 12, 2021

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