Add updated Scrimba tutorial with new tool_call syntax

[ArsalaBangash]

Summary

This PR adds an updated Scrimba tutorial to How to build an agent with the Node.js SDK

Motivation

The previous Scrimba tutorial code was removed after the new tool_call syntax was introduced.

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[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[ArsalaBangash]

Hi! This PR has been marked as stale because no reviewer was assigned. Would greatly appreciate if this is reviewed soon. #929 has also been pending for a while but it's ready to be merged!

[github-actions[bot]]

This PR is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[github-actions[bot]]

This PR was closed because it has been stalled for 10 days with no activity.