refactor(create-docusaurus): remove useless dependencies (docusaurus-utils, execa, fs-extra) + simplify some code#11684

slorber merged 15 commits intomainfacebook/docusaurus:mainfrom

slorber/optimize-create-docusaurus-dependenciesfacebook/docusaurus:slorber/optimize-create-docusaurus-dependenciesCopy head branch name to clipboard