Admin group: single table, defense actions in cells; flash messages as toasts

web/src/main/resources/templates/learn/index.html

@@ -20,9 +20,6 @@
         <span id="sort-status-text">Изменения не сохранены…</span>
     </div>
 
-    <div th:if="${notice}" class="alert alert-success" th:text="${notice}"></div>
-    <div th:if="${error}" class="alert alert-error" th:text="${error}"></div>
-
     <div th:if="${tree == null || #lists.isEmpty(tree.chapters)}" class="card card-body text-muted">
         Материалы ещё не добавлены.
     </div>