Sync with reactjs.org @ 543c7a0d

[react-translations-bot]

This PR was automatically generated.

Merge changes from reactjs.org at 543c7a0d

The following files have conflicts and may need new translations:

• [ ] README.md
• [ ] content/404.md
• [ ] content/docs/cdn-links.md
• [ ] content/docs/components-and-props.md
• [ ] content/docs/hello-world.md
• [ ] content/docs/higher-order-components.md
• [ ] content/docs/hooks-effect.md
• [ ] content/docs/hooks-intro.md
• [ ] content/docs/hooks-state.md
• [ ] content/docs/introducing-jsx.md
• [ ] content/docs/lists-and-keys.md
• [ ] content/docs/nav.yml
• [ ] content/docs/rendering-elements.md
• [ ] content/docs/state-and-lifecycle.md
• [ ] content/footerNav.yml
• [ ] content/headerNav.yml
• [ ] content/home/examples/a-component-using-external-plugins.js
• [ ] content/home/examples/a-component-using-external-plugins.md
• [ ] content/home/examples/a-simple-component.js
• [ ] content/home/examples/a-simple-component.md
• [ ] content/home/examples/a-stateful-component.md
• [ ] content/home/examples/an-application.js
• [ ] content/home/examples/an-application.md
• [ ] content/home/marketing/component-based.md
• [ ] content/home/marketing/declarative.md
• [ ] content/home/marketing/learn-once-write-anywhere.md
• [ ] content/tutorial/nav.yml
• [ ] content/tutorial/tutorial.md
• [ ] gatsby-config.js
• [ ] src/components/LayoutFooter/Footer.js
• [ ] src/components/LayoutHeader/DocSearch.js
• [ ] src/components/LayoutHeader/Header.js
• [ ] src/pages/index.js

Please fix the conflicts by pushing new commits to this pull request, either by editing the files directly on GitHub or by checking out this branch.

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