🔥(frontend) remove all code related to template

The template feature is removed from the frontend
applications. It was used mainly for document export
with predefined templates.

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

@@ -35,9 +35,6 @@ test.describe('Doc Export', () => {
     await expect(
       page.getByText(/Download your document in a \.docx, \.odt.*format\./i),
     ).toBeVisible();
-    await expect(
-      page.getByRole('combobox', { name: 'Template' }),
-    ).toBeVisible();
     await expect(page.getByRole('combobox', { name: 'Format' })).toBeVisible();
     await expect(
       page.getByRole('button', {
@@ -236,20 +233,6 @@ test.describe('Doc Export', () => {
       })
       .click();
 
-    await page
-      .getByRole('combobox', {
-        name: 'Template',
-      })
-      .click();
-
-    await page
-      .getByRole('option', {
-        name: 'Demo Template',
-      })
-      .click({
-        delay: 100,
-      });
-
     await new Promise((resolve) => setTimeout(resolve, 1000));
 
     await expect(page.getByTestId('doc-export-download-button')).toBeVisible();