🌐 Add Vietnamese translation for `docs/vi/docs/features.md` and `docs/vi/docs/index.md` (#3006)
Co-authored-by: Nguyen Khac Thanh <nkthanh@Nguyens-MacBook-Pro.local>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>
