clean up product demo readme to generate on flat-files

roles/generate_readme/templates/readme.j2

@@ -26,7 +26,8 @@ ansible-playbook playbooks/install_demo.yml -e @choose_demo.yml
     <th>Video Walkthrough</th>
     <th>Workshop Types</th>
   </tr>
-{% for key, value in demos.items()|sort(attribute='1.name') %}
+
+{% for key, value in hostvars[inventory_hostname].items()|rejectattr('0', 'match', 'ansible_')|selectattr('1.name', 'defined') %}
   <tr>
     <td>{{value.name}}</td>
     <td>{{value.author}}</td>