Illustrations in explaining how Django works

[olasitarska]

I think we should put some useful illustrations in this chapter: https://github.com/asendecka/djangogirls-tutorial/tree/master/django_-_why_you_need_a_webframework. It looks like a big wall of text and it's hard to imagine how Django really works. @asendecka, any ideas for that?:)

[keimlink]

My "Django Introduction" slides contain a slide which has an illustration created using SVGs that shows how a request is processed by Django.