Get an author

curl --request GET \
  --url https://api.marblecms.com/v1/authors/{identifier} \
  --header 'Authorization: Bearer <token>'

{
  "author": {
    "id": "clx123abc",
    "name": "John Doe",
    "image": "https://cdn.example.com/avatar.jpg",
    "slug": "john-doe",
    "bio": "Technical writer and developer",
    "role": "Editor",
    "socials": [
      {
        "url": "https://twitter.com/johndoe",
        "platform": "twitter"
      }
    ],
    "count": {
      "posts": 12
    }
  }
}