Currently it only contains (outdated) explanations how Ironic works.
Move them one level deeper and migrate the content relevant to users:
* Preparing instance images from the installation guide
* Deploying nodes from the standalone guide
Compatibility shims are provided for migrated pages.
Change-Id: I8468da377b7878eb3d1a61e6a6bcd4ac8a5f06d7
6243a4b280