put alias url to landing html created

Sorry for my English, I was testing the module on a Drupal 9 installation, and I'm seeing the same error you reported @Cangurin cleanups. After quickly reviewing the error, I've realized that the 'l()' function is being used, which is deprecated. Perhaps the following code could be an idea to resolve the error.

NodeController.php::120 file.

use Drupal\Core\Link;

if ($vid != $html_page->getRevisionId()) {
$link = Link::fromTextAndUrl($date, new Url('entity.html_page.revision', [
'html_page' => $html_page->id(),
'html_page_revision' => $vid,
]))->toString();
}
else {
$link = $html_page->toLink($date)->toString();
}