Improve git staging part of the git intro

[Sabryr]

Radovan
Sabry: what I meant is that the git staging part of the git intro lesson does not work well currently, too confusing so if I needed to change one thing in the lesson, that would be it: more pictures, better example - of course no problem to change more than the staging but that is the part that I am most unhappy with

[Sabryr]

Sabry started working on this