Article#template

Templates used by Genesys to send emails and display other information are using the Article entity. This automatically indexes their contents in Elasticsearch and also displays these templates to end users:

• https://sandbox.genesys-pgr.org/acn/search2?q=email&section=article
• https://sandbox.genesys-pgr.org/content/smtp.email-verification

Add new property boolean template to Article entity.

Change Genesys code to:

• Not include in ES articles with template == true
• Only display such articles to users with roles ADMINISTRATOR and CONTENTMANAGER, return 404 otherwise
• Content of template articles is not HTML santitized