🏗️(frontend) Footer configurable

To have different footer per instance the
content of the footer is now configurable
from the theme customization file.

See THEME_CUSTOMIZATION_FILE_PATH env var.

src/frontend/apps/e2e/__tests__/app-impress/config.spec.ts

@@ -159,8 +159,8 @@ test.describe('Config: Not loggued', () => {
     const jsonResponse = await response.json();
     expect(jsonResponse.FRONTEND_THEME).toStrictEqual('default');
 
-    const footer = page.locator('footer').first();
+    const header = page.locator('header').first();
     // alt 'Gouvernement Logo' comes from the theme
-    await expect(footer.getByAltText('Gouvernement Logo')).toBeVisible();
+    await expect(header.getByAltText('Gouvernement Logo')).toBeVisible();
   });
 });