[documentation] URGENT: Please review upgrade tutorial instructions

[Farsheed]

Hi, 

I uploaded all the images on to drupal.org for these
doc pages.  Also I changed some images that were
loading from CSL.org to load locally from drupal.org,
and fixed some links.

Lastly, I changed the color of the Basic Upgrade to
red.  I think it  is necessary for people to quickly
find this link on the page, so they don't feel
overwhelmed.

-Farsheed



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