Example site: correct rendering of subscript, superscript and other raw html markup

exampleSite/config.toml

@@ -95,3 +95,9 @@ series = "series"
 
   [services.twitter]
     disableInlineCSS = true
+
+[markup]
+  [markup.goldmark]
+    [markup.goldmark.renderer]
+      # needed to render raw HTML (e.g. <sub>, <sup>, <kbd>, <mark>)
+      unsafe = true