Revamp of GitHub Actions Presentation Repo

[mickeygousset]

It is time for a revamp of the GitHub Actions Presentation Repo. This revamp is overdue for a variety of reasons, including:

• New features have been added to GitHub Actions that are not represented as demos yet
• Workflows and actions are out of date and should be updated
• Demos are spread across several repositories. While this can be necessary depending on the demo, there is opportunity to consolidate more of the demos in this repo
• Automation needs to be created to reset the repo and its settings to a clean state at the beginning of a demo. This ensures the environment is not in a "wierd" state

We may make use of GitHub Projects to track the work that needs to be done.

This issue will serve as the main "epic" that will drive any new issues, such as "features" or "tasks".