fix: update documentation with. zksync2-examples

[Ngozi-Txfusion]

What

• Removed links to the ZKsync examples repository.
• Actual code snippets were inserted from the examples repository.
• Ensured proper formatting of all inserted code snippets.
• Updated navigation links and internal references.

Why

• The SDK team won't be able to maintain the documentation and the ZKsync examples repository.
• Directly embedding code snippets improves the user experience by providing immediate access to examples.
• Including examples within the documentation enhances its quality and relevance.

[github-actions]

Visit the preview URL for this PR (updated for commit b6e85d9):

https://zksync-sdk-docs-staging--pr74-update-documantation-pm44juil.web.app

_{(expires Tue, 30 Jul 2024 23:04:54 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: f6539d831ccfa61081c09db66b409eadb94db989}

[github-actions]

🎉 This issue has been resolved in version 1.12.1 🎉

The release is available on GitHub release

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