fix(translations/ru): improve Russian translation quality and consistency

[tarasbln]

Summary

This PR updates the Russian translation to match the current English original version and fixes quality issues.

What Changed

Structural Updates

The Russian translation was based on an outdated version that:

• Used git checkout instead of git switch
• Missed the "Where to go from here?" section
• Had different structure and missing content

This PR brings the Russian translation in line with the current English README.

Impact

These changes:

• Align the Russian translation with the current English version
• Improve accuracy and readability for Russian-speaking beginners
• Maintain consistency throughout the document
• Make the tutorial more accessible to newcomers

[tarasbln]

@Roshanjossey Could you review this when you get a chance? It syncs the Russian translation with the current English README. Thanks!