fix: update code examples to use ES6 module syntax as required by actions/core v3.0.0

[FidelusAleksander]

Summary

This pull request updates the project setup and source files to use ES modules instead of CommonJS, and ensures compatibility with modern JavaScript syntax. The changes are mainly focused on updating initialization steps and refactoring import/export statements.

Project setup modernization:

• Updated the Node.js project initialization command in .github/steps/1-step.md to set the package type to module, enabling ES module syntax.

Source code refactoring for ES modules:

• Changed require statements to import statements in src/joke.js and src/main.js to use ES module syntax. [1] [2]
• Updated the export in src/joke.js from module.exports to export default for ES module compatibility.

Changes

Closes: #65

Task list

• For workflow changes, I have verified the Actions workflows function as expected.
• For content changes, I have reviewed the style guide.

[Copilot]

Pull request overview

This PR migrates the JavaScript code examples in a GitHub Skills exercise ("Write JavaScript Actions") from CommonJS (require/module.exports) to ES module syntax (import/export default). This is necessary because the project is being configured as an ES module (via "type": "module" in package.json), which resolves issue #65 where running node src/main.js failed due to a mismatch between module systems.

Changes:

• Updated the npm init command in step 1 to also set "type": "module" in package.json via npm pkg set type=module.
• Converted require/module.exports to import/export default in the src/joke.js code example in step 2.
• Converted require to import statements in the src/main.js code example in step 2.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
.github/steps/1-step.md	Appends npm pkg set type=module to the project initialization command to enable ES modules.
.github/steps/2-step.md	Converts code examples for joke.js and main.js from CommonJS to ES module syntax.

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