add userboxes and use them instead of flash

views/user/signup.etlua

@@ -1,8 +1,8 @@
 <% render("views.common.topnav") -%>
 <div class="darkbg login-container">
   <h1>Sign up</h1>
-  <% if err then %>
-    <h2><%= err %></h2>
+  <% if infobox then %>
+    <% render("views.common.infobox", infobox) %>
   <% end %>
   <form method="post" action="<%= url_for('user_signup') %>" enctype="multipart/form-data">
     <label for="username">Username</label><br>