fix babycode guide links

app/templates/guides/user-guides/01-introduction.html

@@ -71,6 +71,6 @@
   </ol>
   <p>You may edit or delete your posts after creating them. Edited posts will show when they were edited instead of when they were posted.</p>
   <p>You can quote another user's post by pressing the <button>Quote</button> button on that post. This will copy the contents of it into the reply box and mention the user.</p>
-  <p>Posts are written in a markup language called Babycode. <a href="{{ url_for("guides.guide_page", category='user', slug='babycode') }}">More information on it can be found in a separate guide.</a></p>
+  <p>Posts are written in a markup language called Babycode. <a href="{{ url_for("guides.guide_page", category='user-guides', slug='babycode') }}">More information on it can be found in a separate guide.</a></p>
 </section>
 {% endblock %}