Properly re-add underage rule.

templates/themes/rules/rules.html

@@ -24,6 +24,7 @@
     <div class="ban" id="global">
       <h2>GLOBAL RULES</h2>
       <ol start="0">
+<li>Do not post in or view any boards if you are under 18 years of age.</li>
 <li>If you break the rules we will delete your post. Do it repeatedly and you'll be derezzed.</li>
 <li>Do not call for mods, or announce reports in a thread.</li>
 <li>Always argue in good faith and avoid using personal attacks.</li>