Enhanced Node.js client documentation

[paullyy8]

Changes

• Improved the clarity and completeness of the documentation.
• Added detailed step-by-step usage instructions.
• Included examples for advanced usage, such as authentication, TypeScript, and worker threads.
• Provided troubleshooting tips and links to further resources.

Reason for Changes

These enhancements aim to make the documentation more helpful for new users and provide clear, step-by-step instructions for getting started with the QuestDB Node.js client.

[CLAassistant]

All committers have signed the CLA.