Cleanup for CompanyUser rename

src/Server/Entities/Company.cs

@@ -15,7 +15,7 @@ namespace BoredCareers.Entities {
         public string Description { get; set; } = "";
     }
 
-    public class CompanyUser {
+    public class Employee {
         public int ID { get; set; } // PK
         public int AccountID { get; set; } // FK
         public int CompanyID { get; set; } // FK