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/components/extended_video_player.js

@@ -7,7 +7,7 @@ class ExtendedVideoPlayer extends React.PureComponent {
     src: PropTypes.string.isRequired,
     time: PropTypes.number,
     controls: PropTypes.bool.isRequired,
-    muted: PropTypes.bool.isRequired
+    muted: PropTypes.bool.isRequired,
   };
 
   handleLoadedData = () => {