New page structure (#1377)

* - new page structure

* - removed unecessary task changes

* - handleClick -> onClick

front/src/modules/ui/layout/components/PageAddButton.tsx

@@ -0,0 +1,19 @@
+import { IconButton } from '@/ui/button/components/IconButton';
+import { IconPlus } from '@/ui/icon';
+
+type OwnProps = {
+  onClick: () => void;
+};
+
+export function PageAddButton({ onClick }: OwnProps) {
+  return (
+    <IconButton
+      icon={<IconPlus size={16} />}
+      size="medium"
+      variant="secondary"
+      data-testid="add-button"
+      accent="default"
+      onClick={onClick}
+    />
+  );
+}