Cleanup: Remove unnecessary class

We just want to print the list items one by one, so do that the
Mustache way. See the second tip in
https://www.vodori.com/blog/helpful-mustache-template-tips/
Cleanup: Remove unused parameter
Cleanup: Expose repeated process_template()

process_template() is used in several files across all the
project, so extracting this will help with future refactoring
looking forward easing code maintenance.