docs: updated package.json content and electron version in build first app guide

[dufipl]

Description of Change

The Building your First App guide states: "Your package.json file should look something like this after initializing your package and installing Electron." then package.json content is shown, but it is not up to date with how it looks now when creating the app by using the commands provided in the guide and the default values. This was corrected by adding:

  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },

which is added by default while npm init. Also bumped the electron version.

Checklist

• relevant documentation, tutorials, templates and examples are changed or added
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

notes: no-notes

[welcome]

💖 Thanks for opening this pull request! 💖

We use semantic commit messages to streamline the release process. Before your pull request can be merged, you should update your pull request title to start with a semantic prefix.

Examples of commit messages with semantic prefixes:

• fix: don't overwrite prevent_default if default wasn't prevented
• feat: add app.isPackaged() method
• docs: app.isDefaultProtocolClient is now available on Linux

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[erickzhao]

Thanks! I think we recommend using exact versions too so we should make the version numbers not use the caret. :)

[dufipl]

@erickzhao thanks for the comment :)
I've removed the carets, could you take another look?

[erickzhao]

docs: lgtm

[electron-docs-reviewer]

Approving on behalf of the Electron Docs Team

[welcome]

Congrats on merging your first pull request! 🎉🎉🎉

[release-clerk]

No Release Notes

[trop]

I have automatically backported this PR to "23-x-y", please check out #37742

[trop]

I have automatically backported this PR to "24-x-y", please check out #37743