Change naming for dto

Author: Joshua-Lester3

EssentialCSharp.Web/Services/SiteMappingDto.cs

@@ -3,7 +3,7 @@
 public class SiteMappingDto
 {
     public required int Level { get; set; }
-    public required List<string> Key { get; set; }
+    public required List<string> Keys { get; set; }
     public required string Href { get; set; }
     public required string Title { get; set; }
     public required IEnumerable<SiteMappingDto> Items { get; set; }

EssentialCSharp.Web/Services/SiteMappingService.cs

@@ -22,7 +22,7 @@ public IEnumerable<SiteMappingDto> GetTocData()
             return new SiteMappingDto()
             {
                 Level = 0,
-                Key = [firstX.Keys.First()],
+                Keys = [firstX.Keys.First()],
                 Href = $"{firstX.Keys.First()}#{firstX.AnchorId}",
                 Title = $"Chapter {x.Key}: {firstX.ChapterTitle}",
                 Items = GetItems(orderedX.Skip(1), 1)
@@ -42,7 +42,7 @@ private static IEnumerable<SiteMappingDto> GetItems(IEnumerable<SiteMapping> cha
             .Select(i => new SiteMappingDto()
             {
                 Level = indentLevel,
-                Key = i.Keys,
+                Keys = i.Keys,
                 Href = $"{i.Keys.First()}#{i.AnchorId}",
                 Title = i.RawHeading,
                 // Any children of this node will be /after/ this node,