[Snyk] Security upgrade gatsby from 2.18.18 to 3.0.0#16

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Rednickle wants to merge 1 commit intomasterfrom snyk-fix-a43879c86d12945275706a0cb3379b76

+9,547-5,484

Commits on Mar 10, 2021

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