* Reuse the images from the repository in README
* Shrink the images to 800-1000px
* Fix incorrect sectioning, typos, missing info etc. on ReadTheDocs
* Add a tutorial step about the --abort-on-sla-failure feature
* Move Rally deployment engines to a separate tutorial step
* rally use deployment -> rally deployment use
Change-Id: Id5f492e40a041aa3308e9faa21b833220415323d
Some people still are unable to find our new docs. We put a couple of links
to our ReadTheDocs page to the README.rst file to fix this. We also remove
the link to Wiki/HowTo because it is out-of-date.
Change-Id: I70b2d476723c9f2bf705aef536ee6bc512d49ddf
