docs: Update template README.md (JavaScript, TypeScript)

[pmeinhardt]

Use npx to run project-specific cdk, not a globally installed version.

This ensures everybody working on the project uses the same version of the command-line interface.

With the previous instructions, if anybody had cdk installed globally, e.g., via npm install --global aws-cdk or homebrew install aws-cdk, they would run that version. It seems desirable that everybody working on a CDK app uses the same version of the command-line interface, as specified in package.json (or package-lock.json).

Example:

Given a package.json which specifies "aws-cdk": "2.104.0" and a globally installed cdk, this can happen:

$ cdk --version
2.108.1 (build 2320255)

$ npx cdk --version
2.104.0 (build 3b99abe)

---

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: c2b74be
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).