Bump react from 16.10.2 to 16.11.0 in /website (#6723)
Bumps [react](https://github.com/facebook/react/tree/HEAD/packages/react) 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)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Co-authored-by: null <27856297+dependabot-preview[bot]@users.noreply.github.com>