We have rolled out an experimental feature to export tours (in Inline Manual terminology Topics) that are compatible with Drupal 8 tour module. You can now use the Authoring tool and Inline Manual infrastructure to manage your tours. These exported tours you can play out of the box in Drupal 8. If you are after more advanced solution, that can be used for your clients, check out the Inline Manual module. I believe this will help in easier creation and maintenance of tours for developers as well as sharing and letting others to contribute.