Improve eslint rules (#3147)

* Add semi to ESLint rules

* Add padded-blocks to ESLint rules

* Add comma-dangle to ESLint rules

* add config/webpack and storyboard

* add streaming/

* yarn test:lint -- --fix

app/javascript/mastodon/features/ui/containers/loading_bar_container.js

@@ -2,7 +2,7 @@ import { connect }    from 'react-redux';
 import LoadingBar from 'react-redux-loading-bar';
 
 const mapStateToProps = (state) => ({
-  loading: state.get('loadingBar')
+  loading: state.get('loadingBar'),
 });
 
 export default connect(mapStateToProps)(LoadingBar.WrappedComponent);