sync: migrate sync devices from fs to mongodb

Notesnook.API/Program.cs

@@ -17,13 +17,12 @@ You should have received a copy of the Affero GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-using System;
+using System.Net;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 using Streetwriters.Common;
-using System.Net;
 
 namespace Notesnook.API
 {