Updated admin page to be more streamlined and added the beginning of the blogging features

OpenArchival.Blazor.AdminPages/ArchiveItems/ValidationModels/ArtifactEntryValidationModel.cs

@@ -40,6 +40,8 @@ public class ArtifactEntryValidationModel
 
     public bool IsPublicallyVisible { get; set; } = true;
 
+    public int Quantity { get; set; }
+
     public ArtifactEntry ToArtifactEntry(ArtifactGrouping? parent = null)
     {
         List<ArtifactEntryTag> tags = new();
@@ -74,6 +76,7 @@ public class ArtifactEntryValidationModel
             Title = Title,
             ArtifactGrouping = parent,
             RelatedTo = RelatedArtifacts,
+            Quantity = Quantity
         };
 
         List<ListedName> listedNames = new();