Update notes for intro.
Update notes for vendor approach on HA
Mention SUSE Cloud 4
Drop blurry SUSE cloud image

Wasn't a great gimmick to begin with, and took too long to load.
Add updated reference architecture diagram
Rename Markdown file

Drop the "3" and just go with SUSE Cloud.
Drop background image
Drop joke about scary Crowbar mascot
Merge branch 'master' into gh-pages