Refactor nav pages, add page to see users of the server

BTCPayServer/Models/ServerViewModels/UsersViewModel.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace BTCPayServer.Models.ServerViewModels
+{
+    public class UsersViewModel
+    {
+		public class UserViewModel
+		{
+			public string Name
+			{
+				get; set;
+			}
+			public string Email
+			{
+				get; set;
+			}
+		}
+
+		public string StatusMessage
+		{
+			get; set;
+		}
+
+		public List<UserViewModel> Users
+		{
+			get; set;
+		} = new List<UserViewModel>();
+	}
+
+}