Add a "side panel" with common commands

[goranche]

it might be useful to future professionals to have a auto hiding sidebar containing the various commands used throughout the tutorial (pwd, ls, cd, mkdir, jekyl serve, ctrl+c, ...)

since the tutorial is written with jekyll in mind, it would probably be best to include content from a file into a div, and use that as a side panel 💭

thoughts?

[ialja]

Maybe, or a downloadable file (PDF) that they can save onto their computer. They won't really need that many commands though. We'll see what our tests show.