add minified libraries

dist/diff.html

@@ -1,8 +1,8 @@
 {% extends "base.html" %}
 
 {% block head %}
-        <link rel="stylesheet" href="/static/css/diff2html.css">
-        <script src="/static/js/diff2html.js"></script>
+        <link rel="stylesheet" href="/static/css/diff2html.min.css">
+        <script src="/static/js/diff2html.min.js"></script>
 {% end %}
 
 {% block body %}