Add new story for darkmode (#317)

* Add a new story for dark mode

* Reorganize storybook menu

* Fix command menu margins

* Fix tests

front/src/__stories__/App.darkMode.stories.tsx

@@ -0,0 +1,30 @@
+import { Meta } from '@storybook/react';
+
+import { App } from '~/App';
+import { graphqlMocks } from '~/testing/graphqlMocks';
+import { mockedUserJWT } from '~/testing/mock-data/jwt';
+
+import { Story } from './App.stories';
+import { renderWithDarkMode } from './shared';
+
+const meta: Meta<typeof App> = {
+  title: 'App/App/DarkMode',
+  component: App,
+};
+
+export default meta;
+
+export const DarkMode: Story = {
+  render: () => renderWithDarkMode(true),
+  loaders: [
+    async () => ({
+      accessTokenStored: window.localStorage.setItem(
+        'accessToken',
+        mockedUserJWT,
+      ),
+    }),
+  ],
+  parameters: {
+    msw: graphqlMocks,
+  },
+};