Add a note that dark mode is experimental

blog/templates/edition-2/index.html

@@ -118,6 +118,8 @@
             </p>
         </div>
     </div>
+
+    {{ snippets::dark_mode_note() }}
 </aside>
 
 {% endblock after_main %}

blog/templates/edition-2/page.html

@@ -130,6 +130,8 @@
             {% endfor %}</ul>
         </div>
         {%- endif %}
+
+        {{ snippets::dark_mode_note() }}
     </aside>
 
 {% endblock main %}