Support course property

New feature

course: property support a link to a repo & reading the repos config.yml using octokit

a usage example

- course: get-to-know-s3-data-storage

get-to-know-s3-data-storage is a repo under wix-academy owner

The below is equivalent to the above

- course: wix-academy/get-to-know-s3-data-storage

You can still use: title, description & link if you're not including those than the action will take it from the course specified repo config.yml

The course could be a GitHub skills repo then the learner continues and uses the external course.
It allow learning managers to embed/refer to other skills resources & avoid content duplication.

Please set GITHUB_TOKEN with a secret that has access to private repos. See https://github.com/wix-academy/.github/blob/master/workflow-templates/transform-lab-config.yml (wix-academy template)