New CMS version support timelines

<%- if @topic_view.topic.tags.present? %>
<%= t 'js.tagging.tags' %>: <%- @topic_view.topic.tags.each do |t| %> <%= t %> <%- end %>
<% end %>

Our support timelines have been updated to give versions 3 and 4 extended periods of support. For full details, please see the blog post.