Update JavaScript QuickStart README and Remove Unncessary Package

[DanWahlin]

This pull request includes updates to the quickstart sample project, focusing on dependency cleanup, script simplification, and documentation improvement. The most significant changes involve removing an unused Azure SDK package, simplifying the package.json scripts, and clarifying instructions in the README.md.

Dependency Cleanup:

• Removed the @azure/arm-cognitiveservices package from both package.json and package-lock.json, along with its associated metadata and dependencies. This indicates it is no longer required in the project. [1] [2]

Script Simplification:

• Simplified the package.json scripts by removing the create-project script, leaving only the start script.

Documentation Improvement:

• Updated the README.md to clarify that users should fill in "endpoint values" when renaming env.template to .env.