Try to group inc/steps inlines

Pages with many inlines are slower to build by ikiwiki. Now that the set of scenarios and steps is clear, it might be worth checking whether some sequences of steps are always the same and could be grouped in a single page.

Feature Branch: web/10792-group-ia-inlines

Parent Task: #11151 (closed)

Original created by @sajolida on 10792 (Redmine)