Intro_02 length

[butterflyology]

How long should the 02_intro section (including demo) take? The slide deck has been moved to the 'slides' directory. Does 30 minutes seem reasonable for the demo?

[hlapp]

How long should the 02_intro section (including demo) take? [...] Does 30 minutes seem reasonable for the demo?

Tagging @mine-cetinkaya-rundel as she was the one to originally design this section.