Add main navigation bar

Make donations and invitations accessible to everyone

app/views/layouts/application.html.erb

@@ -27,6 +27,10 @@
         <% end %>
       </header>
 
+      <% if user_signed_in? && current_user.confirmed? %>
+        <%= render partial: 'shared/main_nav' %>
+      <% end %>
+
       <% flash.each do |type, msg| %>
         <div class="flash-msg <%= type %>">
           <p><%= msg %></p>