Fixed bug where deletes of artifact groupings would not cascade

OpenArchival.Blazor.Blog/ArticleNotFound.razor

@@ -0,0 +1,15 @@
+@using MudBlazor
+@page "/article-not-found"
+@page "/article-not-found/{Message}"
+
+<MudPaper Class="pa-4 ma-2 rounded" Elevation="3">
+    <MudText Typo="Typo.h1" Align="Align.Center">404: Article Not Found!</MudText>
+    @if (!string.IsNullOrEmpty(Message)) {
+        <MudText Typo="Typo.body1" Align="Align.Center">@Message</MudText>
+    }
+</MudPaper>
+
+@code {
+    [Parameter]
+    public string? Message { get; set; }
+}