Combined PR with current howto progress.

This one takes articles from @michellemurray and adds a howto landing page.

/documentation/howto

What is missing is wiring it into the main page. But at least in this branch we can see the layout.
I think it would be better to use asciidoc macros here for menu/keyboards.

http://asciidoctor.org/docs/asciidoc-syntax-quick-reference/#ui-macros

i.e. menu:OpenShift[Configure Markers]

similar exists for buttons and keyboards.