Update the lesson outline in the Intro episode to reflect new ordering/titles

[kaijagahm]

If we're redefining the "debugging" lesson as more like "defining the problem and making a plan" then that needs to be reflected in the Intro section, which introduces the outline for the rest of the lesson.

Or maybe it's actually stupid to have an outline in the Intro at all? None of the other Carpentries lessons really have that so maybe we should just get rid of it.

But I think our rationale is that the skill we're teaching is "understanding how to approach this category of problem" with a toolbox, so maybe it's fine...