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/account_gallery/index.js

@@ -5,7 +5,7 @@ import PropTypes from 'prop-types';
 import {
   fetchAccount,
   fetchAccountMediaTimeline,
-  expandAccountMediaTimeline
+  expandAccountMediaTimeline,
 } from '../../actions/accounts';
 import LoadingIndicator from '../../components/loading_indicator';
 import Column from '../ui/components/column';