Updated highlight.js to v9.12.0

Fixing problem with raw strings syntax highlighting
Also backported updates to atelier-dune-light.css

src/theme/highlight.css

@@ -1,15 +1,6 @@
-/* Modified Base16 Atelier Dune Light - Theme
-/* Original by Bram de Haan (http://atelierbram.github.io/syntax-highlighting/atelier-schemes/dune) */
-
-.hljs {
-  display: block;
-  overflow-x: auto;
-  background: #f1f1f1;
-  color: #6e6b5e;
-  padding: 0.5em;
-  -webkit-text-size-adjust: none;
-}
-
+/* Base16 Atelier Dune Light - Theme */
+/* by Bram de Haan (http://atelierbram.github.io/syntax-highlighting/atelier-schemes/dune) */
+/* Original Base16 color scheme by Chris Kempson (https://github.com/chriskempson/base16) */
 
 /* Atelier-Dune Comment */
 .hljs-comment,
@@ -61,6 +52,14 @@
   color: #b854d4;
 }
 
+.hljs {
+  display: block;
+  overflow-x: auto;
+  background: #f1f1f1;
+  color: #6e6b5e;
+  padding: 0.5em;
+}
+
 .hljs-emphasis {
   font-style: italic;
 }