Made material data available to templates and refactored testing

[phawxby]

Added the template data to local data to allow the output of the underlying handlebars template as we intend to package up the underlying handlebar files for usage by other teams.

// Add the data to the output
localData.template = {
  content: fileMatter.content,
  path: file
};

Also converted all the testing over to Jest, the test time dropped from 20s to 4s by running in parallel