Bump react-dom from 16.10.2 to 16.11.0 in /website (#6724)
Bumps [react-dom](https://github.com/facebook/react/tree/HEAD/packages/react-dom) from 16.10.2 to 16.11.0.
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/master/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/v16.11.0/packages/react-dom)
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