Showing message at the top of upgrade page (#2713)

* added an upgrade alert tag

* Additional questions page tweak (#2721)

* added the tag to determine which upgrade is listed on the website

* changed regex back

* added an upgrade alert tag

* added the tag to determine which upgrade is listed on the website

* changed regex back

* added upgrade after pull and rebase master

app/views/notes/show.html.erb

@@ -9,6 +9,7 @@
   <% if @node.has_power_tag('series') %><div class="alert alert-info"><%= raw t('notes.show.series') %> <a href="/tag/series:<%= @node.power_tag('series') %>"><%= @node.power_tag('series') %></a>.</div><% end %>
   <% if @node.has_power_tag('build') %><div class="alert alert-info"><%= raw t('notes.show.build') %> <a href="/n/<%= @node.power_tag('build') %>"><%= raw t('notes.show.build_link') %></a>.</div><% end %>
   <% if @node.has_power_tag('with') && current_user && @node.coauthors.collect(&:username).include?(current_user.username) %> <div class="alert alert-success"> You are a coauthor of this post. This attributes your contribution, and gives you edit access to the note. <a href="https://publiclab.org/wiki/power-tags#Coauthorship"> Learn more </a></div><% end %>
+  <% if @node.has_power_tag('upgrade') %><div class="alert alert-success"> This is an upgrade for <%= @node.power_tag('upgrade') %>">. Try building it and <a href="/n/<%= @node.power_tag('upgrade') %>"> report back </a>how it goes.</div><% end %>
 
   <% if @node.main_image %>
     <a class="main-image" style="max-width:100%;width:800px;" href="<%= @node.main_image.path(:original) %>">