Bump babel-preset-env from 1.6.1 to 1.7.0 in /website (#6588)
Bumps [babel-preset-env](https://github.com/babel/babel-preset-env) from 1.6.1 to 1.7.0.
- [Release notes](https://github.com/babel/babel-preset-env/releases)
- [Changelog](https://github.com/babel/babel-preset-env/blob/1.x/CHANGELOG.md)
- [Commits](https://github.com/babel/babel-preset-env/compare/v1.6.1...v1.7.0)
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