Reorg

restructure so that this can be merged into https://github.com/ahgittin/incubator-brooklyn/tree/master/docs

site-structure plugin uses relative references, with content in `/website`, and `_build/production-build.sh` setting config so that files can be placed in the root

in the final commit the repo is wiped apart from a single readme pointing at the new merged location
(worth merging this however so the transition is kept, at least until this repo is wiped! :) )