Add new story for darkmode (#317)

* Add a new story for dark mode

* Reorganize storybook menu

* Fix command menu margins

* Fix tests

front/src/modules/ui/layout/states/isThemeEnabledState.ts

@@ -1,6 +0,0 @@
-import { atom } from 'recoil';
-
-export const isThemeEnabledState = atom<boolean>({
-  key: 'isThemeEnabledState',
-  default: true,
-});