Remove deleted articles from the category list cache.

After DELETE, the category view kept showing the article until a full reload because Redux still held it.

src/api/index.js

@@ -179,6 +179,7 @@ export const article = {
 
   /**
    * DELETE /api/article/:sku → 204
+   * Errors: 400 Article has children, 401, 403, 404 Article not found
    */
   delete(sku) {
     return http(`/api/article/${encodeURIComponent(sku)}`, {