🎨(frontend) get the brand logo from the theme

We want to get the brand logo from the theme.
This way, we will be able to change the
logo easily just by switching to another theme.

src/frontend/apps/impress/cunningham.ts

@@ -39,6 +39,12 @@ const config = {
           xxs: '320px',
           xs: '480px',
         },
+        logo: {
+          src: '',
+          widthHeader: '',
+          widthFooter: '',
+          alt: '',
+        },
       },
       components: {
         datagrid: {
@@ -268,6 +274,12 @@ const config = {
             base: 'Marianne',
           },
         },
+        logo: {
+          src: '/assets/logo-gouv.svg',
+          widthHeader: '110px',
+          widthFooter: '220px',
+          alt: 'Gouvernement Logo',
+        },
       },
       components: {
         alert: {