removed unnecessary using statements

server/Persistence/Repositories/EpisodeRepository.cs

@@ -1,7 +1,6 @@
 using MongoDB.Driver;
 using MongoDB.Driver.Linq;
 using server.Models;
-using System.Linq;
 
 namespace server.Persistence.Repositories
 {

server/Persistence/Repositories/IEpisodeRepository.cs

@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using server.Models;
+using server.Models;
 
 namespace server.Persistence.Repositories
 {