Linting - modernize set of linting rules

[dgutride]

PatternFly-React defines the standard set of linting rules used both by PatternFly React core libraries and PatternFly Extensions. These should be reviewed to ensure the set of rules are up to date with industry React development standards.

1) Identify a set of industry standards (is there a set of best practices for linting rules that can be followed?) 2) Introduce new rules and a plan for the React libraries to adopt these

[stale[bot]]

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[nicolethoen]

Seems console dot has settled on some standard linting rules: https://github.com/RedHatInsights/frontend-starter-app/blob/master/.eslintrc.js

I'd recommend this is where we start or what we borrow.