feat(Navigation) Improved desktop navigation UI

Model/Website/WebPageModel.cs

@@ -3,7 +3,7 @@
 public class WebPageModel
 {
     public int Id { get; set; }
-    public int WebSectionModelId { get; set; }
+    public int? WebSectionModelId { get; set; }
     public string Name { get; set; } = "Add name";
     public string Description { get; set; } = "Add description";
     public string Href { get; set; } = null;

Model/Website/WebSectionModel.cs

@@ -1,4 +1,7 @@
-namespace Model.Website;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Model.Website;
 
 public class WebSectionModel
 {
@@ -8,4 +11,6 @@ public class WebSectionModel
     public string Href { get; set; } = null;
     public int Order { get; set; } = 0;
     public string IsPrivate { get; set; } = "True";
+
+    [NotMapped] public List<WebPageModel> WebPageModels { get; set; } = new List<WebPageModel>();
 }