Move off of airbnb for linting

[jfhbrook]

airbnb linting rules are a moving target, and it's currently making it difficult to upgrade the airbnb rules - which in turn is making it difficult to upgrade eslint! We're a few versions behind on both.

There's functionality in eslint that can print the config - https://github.com/eslint/eslint/pull/5145 so assuming we can get that to work with the current version of the airbnb rules, we should be able to dump that config, overwrite .eslintrc.json and remove airbnb's linting rules from our dependencies.