Add f8 documentation

http://fabric8.io/guide/ipaas.html
https://github.com/fabric8io/fabric8/issues/4310

it be really called out on this page:
http://fabric8.io/guide/ipaas.html
and have its own dedicated page to describe its awesome. There’s a 1 click app now in the `Run…` screen if you follow the vagrant image:
http://fabric8.io/guide/getStartedVagrant.html

we should tell folks more about the awesome thats there!

The docs are here in gitbook format:
https://github.com/fabric8io/fabric8/tree/master/docs

the index/TOC is here:
https://github.com/fabric8io/fabric8/blob/master/docs/SUMMARY.md