fix: add missing ViewData title assignment

OliverBooth/Pages/Blog/Article.cshtml

@@ -11,6 +11,7 @@
 }
 
 @{
+    ViewData["Title"] = post.Title;
     Author author = Model.Author;
     DateTimeOffset published = post.Published;
 }

OliverBooth/Pages/Blog/Index.cshtml

@@ -1,6 +1,10 @@
 @page
 @model OliverBooth.Pages.Blog.Index
 
+@{
+    ViewData["Title"] = "Blog";
+}
+
 <div id="all-blog-posts">
     @await Html.PartialAsync("_LoadingSpinner")
 </div>