[Snyk] Security upgrade jekyll from 1.0.0 to 3.0.0#4

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snyk-fix-c53a52141bc7d23a0b1f7c10fed0f51fGerHobbelt/bootswatch:snyk-fix-c53a52141bc7d23a0b1f7c10fed0f51fCopy head branch name to clipboard