Fix code blocks styling.

_includes/head.html

@@ -19,10 +19,11 @@
 
   <title>{{ page.title }} - {{ site.title }}</title>
   <link rel="stylesheet" href="{{ "/assets/css/just-the-docs.css" | absolute_url }}">
+  <link rel="stylesheet" href="{{ "/assets/css/geckoview.css" | absolute_url }}">
   {% if site.search_enabled != nil %}
   <script type="text/javascript" src="{{ "/assets/js/vendor/lunr.min.js" | absolute_url }}"></script>
   {% endif %}
   <script type="text/javascript" src="{{ "/assets/js/just-the-docs.js" | absolute_url }}"></script>
 
   <meta name="viewport" content="width=device-width, initial-scale=1">
-</head>
+</head>

assets/css/geckoview.css

@@ -0,0 +1,6 @@
+/* There is some code in just-the-docs that completely breaks styling for code
+ * blocks, this is an attempt to fix that. */
+code {
+    font-weight: inherit;
+    font-size: 80%;
+}