Remove the demo flavor?

[vmassol]

@tmortagne

To be defined what “auto-skip” exactly mean as it can theoretically be long to validate available flavors and finally know that only one is valid for a given wiki.

For me it means the same thing as what we currently do, i.e. compute the flavors to list them and before listing them, if there’s only one, select it automatically and move to the next step.