[Snyk] Security upgrade gatsby from 2.13.73 to 2.16.2#4

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-ed99114783c4caf1460de05911e5796c

+6,340-2,042

Commits on Mar 7, 2020

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