a folder will be a document (empty)
md file with the same name under the folder will be the content of the parent document
md files in the folder will be a document under the folder document
During the Import, we indicate the processing by the running circle in the Import button (same as other Imports)
Once the import is ready, it should be redirected to the root of the imported document, or if there are multiple roots in the zip file, it should be redirected to the first one.
Handle images in the zip files
The missing or unavailable zip file should show a missing image placeholder
Images pointed outside of the zip files should be downloaded and added to Fibery rich text