Move designs.a.o to www.a.o

This series copies across the documents on designs.a.o.

Once this is merged, the majority of the content (apart from the private stuff) can be dropped from designs.a.o.

Documents have been skim checked to see that they appear to be properly rendered. Hugo shortcode refs have been used where possible to increase URL checking when website is generated.

config.toml

@@ -84,3 +84,12 @@ languageCode = "en-us"
 [mediaTypes]
   [mediaTypes."html/pdf-in"]
     suffixes = ["pdf-in"]
+
+# By default Goldmark does not render raw HTMLs and potentially dangerous
+# links. As we have HTML tables in places (that can't readily be implemented
+# in pure Markdown due to large cells with complex content) and can be sure
+# of the content being rendered, switch "unsafe" on to allow these HTML
+# elements to be created.
+[markup]
+  [markup.goldmark.renderer]
+    unsafe = true