[Snyk] Security upgrade gatsby from 2.13.73 to 2.18.10#16

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-1ceaac5f44fdcf238a2e9c2bc6688df3

+14,111-6,782

Commits on Jun 4, 2020

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