fix: replace deletedField with published_at for episodes

- remove delete_at field + soft delete for media and pages
- update CodeIgniter4 to 4.2.0 + update all starter files
- explicitly use builder() when creating queries from model

modules/Admin/Controllers/BaseController.php

@@ -19,7 +19,7 @@ use ViewThemes\Theme;
  * For security be sure to declare any new methods as protected or private.
  */
 
-class BaseController extends Controller
+abstract class BaseController extends Controller
 {
     /**
      * Constructor.