Add global app styles to the StoryBook, fix casing for UI stories

.storybook/storyDecorator.tsx

@@ -5,6 +5,8 @@ import storeFactory from 'app/storeFactory';
 
 const store = storeFactory();
 
+import 'app/index.scss';
+
 export default story => (
   <ContextProvider store={store} history={browserHistory}>
     {story()}

packages/app/components/ui/form/Button.story.tsx

@@ -3,7 +3,7 @@ import { storiesOf } from '@storybook/react';
 
 import Button from './Button';
 
-storiesOf('ui/form', module).add('Button', () => (
+storiesOf('UI/Form', module).add('Button', () => (
   <>
     <div>
       <Button label="Green Button" />{' '}