RVRNEXT-24 replace id-based search to slug-based for communities

src/Repository/CommunityRepository.php

@@ -8,4 +8,9 @@ class CommunityRepository
     {
         return \Container::$persistentDataManager->selectFromDbById($id, Community::class);
     }
+
+    public function getBySlug(string $slug): ?Community
+    {
+        return \Container::$persistentDataManager->selectFromDbBySlug($slug, Community::class);
+    }
 }