The "Installation" book should not include "What is Django?" chapter

[maciejgryka]

I hope this is the right place for this issue, I couldn't find anything better!

I'm just going through the Installation book that was linked in the recent email to teams and coaches. I've notices that the "What is Django?" chapter seems a little out of place. Could we remove it from there (it should still stay in the main tutorial ofcourse!) and maybe add the one about the Code Editor instead?

Thanks!

[olasitarska]

@asendecka will fix it today :)