Add helpful image to 2020/ferguson1

.. at least helpful to those doing a special thing :-)

Updated .entry.json and rebuilt respective html files.

2020/ferguson1/.entry.json

@@ -245,6 +245,14 @@
             "display_via_github" : true,
             "entry_text" : "markdown source for bugs.html"
         },
+        {
+            "file_path" : "cake-on-cooling-rack.jpg",
+            "inventory_order" : 4000000000,
+            "OK_to_edit" : true,
+            "display_as" : "image",
+            "display_via_github" : false,
+            "entry_text" : "Double-layered Chocolate Fudge Cake on cooling rack"
+        },
         {
             "file_path" : "cake.jpg",
             "inventory_order" : 4000000000,