✅(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-grid.spec.ts

@@ -226,6 +226,8 @@ test.describe('Documents filters', () => {
 
     await allDocs.click();
 
+    await page.waitForURL('**/?target=all_docs');
+
     let url = new URL(page.url());
     let target = url.searchParams.get('target');
     expect(target).toBe('all_docs');