global: move more config to env vars

Notesnook.API/Authorization/NotesnookUserRequirement.cs

@@ -17,7 +17,6 @@ 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.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Authorization;
 

Notesnook.API/Authorization/SyncRequirement.cs

@@ -24,7 +24,6 @@ using System.Threading.Tasks;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Authorization.Policy;
 using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.SignalR;
 
 namespace Notesnook.API.Authorization
 {