[DO] Improving Getting started for DO.

[Oxyjun]

Summary

1. Using syncKey across JS / TS code blocks so that users who are using one language can just switch tabs once.
2. Adding a separate "Summary and final code" heading, which includes the full final code of index.ts. This section also explicitly lists the main steps of the tutorial.

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Improved the getting started documentation for Durable Objects by enhancing code block synchronization and providing a comprehensive summary section.

• Implemented syncKey for JavaScript and TypeScript code blocks to facilitate easier navigation for users.
• Added a new section summarizing the tutorial steps and including the complete final code for index.ts.
• Clarified the main objectives achieved by completing the tutorial.

Modified Files

• src/content/docs/durable-objects/get-started.mdx

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[github-actions]

Preview URL: https://e1d81d22.preview.developers.cloudflare.com
Preview Branch URL: https://jun-do-getting-started-full-code.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/durable-objects/get-started/	https://jun-do-getting-started-full-code.preview.developers.cloudflare.com/durable-objects/get-started/