Fix minor issues in index.html
diff --git a/index.html b/index.html
index c32319b..eff0114 100644
--- a/index.html
+++ b/index.html
@@ -88,7 +88,7 @@
<p>If you’re still not sold, you can <a href="examples.html">view more examples</a> or <a href="test.html">try it out for yourself</a>.</p>
</section>
-<section id="features-full">
+<section id="features-full" class="language-markup">
<h1>Full list of features</h1>
<ul>
<li><strong>Only 2KB</strong> minified & gzipped (core). Each language definition adds roughly 300-500 bytes.</li>
@@ -229,7 +229,7 @@ var html = Prism.highlight(code, Prism.languages.javascript);</code></pre>
<footer data-src="templates/footer.html" data-type="text/html"></footer>
-<script src="prism.js" data-default-language="markup"></script>
+<script src="prism.js"></script>
<script src="utopia.js"></script>
<script src="components.js"></script>
<script src="code.js"></script>