build(deps): bump polished from 4.0.5 to 4.1.0 in /docs

Bumps [polished](https://github.com/styled-components/polished) from 4.0.5 to 4.1.0.
- [Release notes](https://github.com/styled-components/polished/releases)
- [Commits](styled-components/polished@v4.0.5...v4.1.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]