🎨(frontend) add dsfr proconnect homepage

If we are with the DSFR theme, we need to add the
proconnect button to the homepage.
We add an option in the cunningham theme to
display the proconnect section instead of the
opensource section.

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

@@ -1,6 +1,6 @@
 import { expect, test } from '@playwright/test';
 
-import { keyCloakSignIn, mockedDocument } from './common';
+import { expectLoginPage, keyCloakSignIn, mockedDocument } from './common';
 
 test.describe('Doc Routing', () => {
   test.beforeEach(async ({ page }) => {
@@ -63,16 +63,13 @@ test.describe('Doc Routing: Not loggued', () => {
     await page.goto('/docs/mocked-document-id/');
     await expect(page.locator('h2').getByText('Mocked document')).toBeVisible();
     await page.getByRole('button', { name: 'Login' }).click();
-    await keyCloakSignIn(page, browserName);
+    await keyCloakSignIn(page, browserName, false);
     await expect(page.locator('h2').getByText('Mocked document')).toBeVisible();
   });
 
+  // eslint-disable-next-line playwright/expect-expect
   test('The homepage redirects to login.', async ({ page }) => {
     await page.goto('/');
-    await expect(
-      page.getByRole('button', {
-        name: 'Sign In',
-      }),
-    ).toBeVisible();
+    await expectLoginPage(page);
   });
 });