Cherry pick following commits from master:

Change path to css file from absolute to relative
Resolve some issuies with new documentation
Exclude Mirantis name from our documentation
Remove ending space fom the link
Resolved typos and minor fixes to new documantation
Update active directory image
Make commands executable

Change-Id: I2923e9a4edae348a1381b167b3016da5a9e828a0