[#MUI-36] Création d'un composant modal (#53)

| Numéro du ticket | Titre du ticket |
|------------------|-----------------|
|                  |                 |

## Description de la PR

## Modification du .env

## Check list

- [ ] Pas de régression
- [ ] TU/TI/TF rédigée
- [ ] TU/TI/TF OK
- [ ] CHANGELOG modifié

Reviewed-on: #53
Co-authored-by: tristan <tristan@yuno.malio.fr>
Co-committed-by: tristan <tristan@yuno.malio.fr>

.playground/playground.nav.ts

@@ -52,6 +52,7 @@ export const navSections: SidebarSection[] = [
     items: [
       {label: 'Sidebar', to: '/composant/sidebar/sidebar'},
       {label: 'Drawer', to: '/composant/drawer/drawer'},
+      {label: 'Modal', to: '/composant/modal/modal'},
       {label: 'Onglets', to: '/composant/tab/tabList'},
     ],
   },