I would like to add categories and articles to the API documentation, but which are separate from the imported yaml file. For example, I have an Overview, Getting Started and Common Flows categories – this content was originally in a Word document and separate from the yaml file. They contain text and images. I added this information as new categories under the Api Reference and then dragged them above the Api Reference category. Unfortunately, when I uploaded the updated yaml file, and deleted the old Api gateway, these categories were also deleted