This PS deletes superfluous documentation and empty files from
the troubleshooting section, and also updates some of the docs
regarding persistent storage troubleshooting.
Change-Id: I60876e40ffe1a1f88ac6c761e8bf10beee92c2a0
This removes empty documentation pages and places the
troubleshooting docs to the top of the docs/source tree. Also
places the pod disruption budget docs to the rest of the
getting-started docs, which are primarily concepts used in
openstack-helm
Change-Id: Ic3f8deefbd873ae5332e14a12351d9967eb22b1b