Add separate Rust and Python documentation sections

## Summary

The docs site currently mixes Rust and Python examples. As the library grows, it would be helpful to have dedicated sections for each language.

## Proposed Changes

- Add a language toggle or separate navigation sections for Rust vs Python docs
- Duplicate relevant pages with language-specific examples
- Consider a tabbed interface for code examples (similar to many SDK docs)

## Benefits

- Clearer documentation for users of each language
- Easier to maintain language-specific features and examples
- Better discoverability for Rust users (currently Python-focused)

## Related

- Installation page already has both, but other pages primarily show Python