Refactor/versions (versioned transactions doc)

[EmekaManuel]

Problem

• Inconsistent use of .then() and async/await for handling asynchronous operations.
• Lack of error handling for blockchain information fetching.
• Unorganized fetching logic within the main code.

Summary of Changes

• Replaced .then() with async/await to maintain consistency in asynchronous code handling.
• Added try/catch blocks to improve error handling and logging.
• Encapsulated the fetching logic into a dedicated getBlockchainInfo function for better code organization and readability.