feat(lint-js): use prettier in eslint; adjust prettier config

[adekbadek]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Reestablishes using prettier in eslint config, and adjusts the prettier config to allow for longer line-width.

How to test the changes in this Pull Request:

1. In a repository which uses newspack-scripts, either install newspack-scripts as a local package, or just replace the two files from this PR in node_modules/newspack-scripts/
2. Run npm run lint:js and observe prettier rule errors
3. Fixing these is a matter of PRs in the other repositories

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[naxoc]

Took this for a test and it works and looks good 👍

[matticbot]

🎉 This PR is included in version 5.6.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀