Updated attachment links to have dropdown for open type

[bookstack] / dev / api / responses / shelves-create.json

{
  "name": "My shelf",
  "description": "This is my shelf with some books",
  "created_by": 1,
  "updated_by": 1,
  "owned_by": 1,
  "slug": "my-shelf",
  "updated_at": "2020-04-10T13:24:09.000000Z",
  "created_at": "2020-04-10T13:24:09.000000Z",
  "id": 14
}