[Snyk] Security upgrade gatsby from 2.13.73 to 3.0.0#29

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kissofire wants to merge 1 commit intomasterfrom

snyk-fix-e0c2f7e4bb0ba5627c0d1d391267afa4

Commits on Mar 9, 2021

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