Fix mobile landscape grid (#738)

* Get storybook working with react-scripts 5

* Fix landscape behavior in MobileGalleryView component

* Update existing tests and add tests for landscape MobileGalleryView

* fix storybook and npm start command

Author: timmydoza

.storybook/main.js

@@ -1,16 +1,18 @@
 module.exports = {
   stories: ['../src/**/*.stories.mdx', '../src/**/*.stories.@(js|jsx|ts|tsx)'],
-  addons: [
-    '@storybook/addon-links',
-    {
-      name: '@storybook/addon-essentials',
-      options: { backgrounds: false, docs: false },
-    },
-    '@storybook/preset-create-react-app',
-  ],
+  addons: ['@storybook/addon-links', {
+    name: '@storybook/addon-essentials',
+    options: {
+      backgrounds: false,
+      docs: false
+    }
+  }, '@storybook/preset-create-react-app'],
   framework: '@storybook/react',
   webpackFinal: config => {
     config.resolve.alias['twilio-video'] = require.resolve('../src/stories/mocks/twilio-video.js');
     return config;
   },
-};
+  core: {
+    builder: 'webpack5'
+  }
+};