fix: Fix timeout when checking if news are available

For some reasons, PostgreSQL doesn't use the same strategy to pick one
or more links in the NewsPicker. In production, picking one link can
take up to ~80 seconds with my account, while it takes less than 1s for
more links.

src/controllers/News.php

@@ -124,7 +124,7 @@ public function showAvailable(Request $request): Response
         }
 
         $news_picker = new services\NewsPicker($user);
-        $links = $news_picker->pick(max: 1);
+        $links = $news_picker->pick(max: 2);
 
         return Response::json(200, [
             'available' => count($links) > 0,