✅(frontend) enhance tests

- Removed 'feature/doc-dnd' branch from the Docker Hub workflow to
streamline deployment processes.
- Updated document creation tests to replace 'New page' button
references with 'New doc' for consistency.
- Enhanced test cases to improve clarity and ensure accurate
verification of document functionalities.
- Added new utility function for creating root subpages, improving test
maintainability.

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

@@ -246,7 +246,7 @@ test.describe('Doc Visibility: Public', () => {
     ).toBeVisible();
 
     await expect(page.getByRole('button', { name: 'search' })).toBeVisible();
-    await expect(page.getByRole('button', { name: 'New page' })).toBeVisible();
+    await expect(page.getByRole('button', { name: 'New doc' })).toBeVisible();
 
     const urlDoc = page.url();
 
@@ -262,7 +262,7 @@ test.describe('Doc Visibility: Public', () => {
 
     await expect(page.locator('h2').getByText(docTitle)).toBeVisible();
     await expect(page.getByRole('button', { name: 'search' })).toBeHidden();
-    await expect(page.getByRole('button', { name: 'New page' })).toBeHidden();
+    await expect(page.getByRole('button', { name: 'New doc' })).toBeHidden();
     await expect(page.getByRole('button', { name: 'Share' })).toBeVisible();
     const card = page.getByLabel('It is the card information');
     await expect(card).toBeVisible();