Offline transactions - Updated durable nonces lesson

[0xCipherCoder]

Problem

Summary of Changes

• Updated code snippets with the latest dependencies and coding conventions
• Fixed content with updated version changes
• Fixed grammar and styling
• Fixed as per guidelines

Fixes #
Unboxed PRs
Starter - Unboxed-Software/solana-lab-durable-nonces#2
Solution - Unboxed-Software/solana-lab-durable-nonces#3

[mikemaccana]

Thanks! While another contributor already won the bounty to update this particular lesson, you're still welcome to fix the conflicts and add your own contributions. We'll make sure everyone that contributes gets acknowledgement in the lesson UI.

[0xCipherCoder]

Thanks! While another contributor already won the bounty to update this particular lesson, you're still welcome to fix the conflicts and add your own contributions. We'll make sure everyone that contributes gets acknowledgement in the lesson UI.

@mikemaccana Sure will resolve conflicts and update it as it follows the proper structure as per the merged PRs.

[github-actions]

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