Localization support for OpenFeature documentation

Hi, OpenFeature team! 👋🏼

Documentation is the backbone of any project, and it’s often the first touchpoint for new contributors and adopters. Having docs available in multiple languages lowers the entry barrier, makes the project more inclusive, and helps adoption in regions where English isn’t the primary language.

As an active contributor to the OpenTelemetry project for over a year, I’ve seen how impactful this process can be. OpenTelemetry now supports several localizations on its docs, which has made it easier for contributors and users in those communities to participate and learn more about the project.

Since I couldn't find any guidance regarding localization in the OpenFeature docs, I'm opening this issue that could serve as a starting point for discussion. The main proposals are:

1. Explore whether the project is open to supporting multiple languages.
2. If so, add localization support to the OpenFeature documentation.
3. Start with the Portuguese localization as a pilot, with potential contributors, and expand gradually.

The issue names no files, tests, or entry points and says that localization guidance is absent from the OpenFeature docs. Start by reviewing the existing documentation structure and discussing whether multilingual support is wanted; completion would require an agreed localization approach and a defined Portuguese pilot scope.