eslint updates

[banderso-n]

Creates skeleton package for new eslint file with rules based on recent airbnb eslint audit https://docs.google.com/spreadsheets/d/1IFX1-EwKxGmF7VZCcEsVp2nu56WkJUhWKBbHLkECagc

STEPS TO TEST
Our eslint config will basically just override airbnb's for the few places where we disagree with them. So to test this config, setup airbnb's config (or base config if you're not using react) as you normally would, then add a line to the extends array in your eslint config to pull in these rules.

1. Pull in the new eslint file (e.g. add this to your package.json)

"nerdery-javascript-standards": "banderso-n/javascript-standards#feature/eslint-updates",

2. Reference the eslint file in your config's "extends" array

// your .eslintrc.js file
module.exports = {
  extends: [
    'airbnb-base', // or just 'airbnb' if it's a react project
    'airbnb-typescript/base', // or just 'airbnb-typescript' if it's a react project (ignore this for vanilla js projects)
    './node_modules/nerdery-javascript-standards/packages/eslint-config-nerdery-base/.eslintrc.js',
  ],
  parserOptions: { // ignore this for vanilla js projects
    project: './tsconfig.json'
  },
  rules: {
    // Your project-specific overrides
  },
};

3. Get testin'

[banderso-n]

FYI there are some commits on master that are not on develop so I'd recommend merging master into develop. It should be done anyway, but it'll also make this PR easier to review.