Create prettier.config.js instead of .prettierrc

[DoctorDerek]

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Rationale

1️⃣ I find it a waste of everyone's time to expect people to memorize the Prettier defaults. 2️⃣ If you want to use Airbnb's line length default (printWidth: 100), that's fine, but let's note that choice in a comment.

Code changes

✅ chore: rename .prettierrc to prettier.config.js and add comments with Prettier defaults to indicate that a non-default value is being used for only printWidth ✅ chore: remove explicit "usePrettierrc: true" from .eslintrc.js (as this is the default setting, so just ["error"] is fine)

Testing

✅ manually tested with npm run lint ✅ manually tested using VS Code extensions (Prettier, ESLint)

Note

1️⃣ There is a line ending bug on Windows associated with erroring on ESLint; I'll submit a .gitattributes file to fix this in a separate PR. 2️⃣ I'm not 100% sure that eslint --fix . has the same behavior of prettier --write . because Prettier explicitly has different rules for line length that ESLint does. I always use Prettier then ESLint for linting, personally. That would need to be another PR.

[DoctorDerek]

per https://github.com/prettier/prettier-eslint#this-solution the answer is yes that eslint --fix will run Prettier first. That was the whole idea of the plugin, apparently.