now only import libraries to highlight code when code exists in post

templates/post.html.tera

@@ -3,7 +3,9 @@
 
 {% block extracss %}
 <link href="/static/css/post.css" rel="stylesheet"/>
+{% if post.content is containing("<code>") %}
 <link href="/static/css/highlightjs/agate.css" rel="stylesheet"/>
+{% endif %}
 {% endblock extracss %}
 
 {% block content %}
@@ -20,8 +22,10 @@
 {% endblock content %}
 
 {% block extrajs %}
+{% if post.content is containing("<code>") %}
   <script src="/static/js/highlight.pack.js"></script>
   <script>
     hljs.initHighlightingOnLoad();
   </script>
+{% endif %}
 {% endblock extrajs %}