Fix/remove old generations on rebuild (#92)

* update(DancingGoat): template.zip

* fix(rebuild): remove old lucene generations from file system on rebuild

---------

Co-authored-by: Boris Kapustík <kapustik@nittin.cz>

src/Kentico.Xperience.Lucene.Core/Indexing/LuceneIndex.cs

@@ -85,6 +85,6 @@ internal LuceneIndex(LuceneIndexModel indexConfiguration, Dictionary<string, Typ
         LuceneIndexingStrategyType = strategy;
 
         string indexStoragePath = Path.Combine(Environment.CurrentDirectory, "App_Data", "LuceneSearch", indexConfiguration.IndexName);
-        StorageContext = new IndexStorageContext(new GenerationStorageStrategy(), indexStoragePath, new IndexRetentionPolicy(4));
+        StorageContext = new IndexStorageContext(new GenerationStorageStrategy(), indexStoragePath, new IndexRetentionPolicy(0));
     }
 }