Fix notifications layout on mobile

src/views/layout.ecr

@@ -34,7 +34,7 @@
         <div class="pure-u-1 pure-u-md-1-5">
         <% if env.get? "authorized" %>
         <div class="pure-g">
-          <div class="pure-u-1 pure-u-md-1-3">
+          <div class="pure-u-1-3">
             <a href="/feed/subscriptions" class="pure-menu-heading">
               <% notifications = env.get("notifications").as(Int32) %>
               <% if notifications > 0 %>
@@ -44,7 +44,7 @@
               <% end %>
             </a>
           </div>
-          <div class="pure-u-1 pure-u-md-2-3">
+          <div class="pure-u-2-3">
               <center><a href="/signout" class="pure-menu-heading">Sign out</a></center>
           </div>
         </div>