List WordPress sites

curl --request GET \
  --url https://convertly.sh/api/wordpress-instances \
  --header 'Authorization: Bearer <token>'

{
  "instances": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "site_url": "<string>",
      "api_key_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "api_keys": {
        "key_prefix": "<string>",
        "last_used_at": "2023-11-07T05:31:56Z"
      }
    }
  ]
}