Updates about the resize and rebuild options for dashboard instances

Changed 'Control the state of an instance' to 'Manage an instance'
and included information about new options to rebuild and resize an
instance.

Change-Id: Ia37d165e681172b8f066c2b48d60859ed06de8f3
Remove unused files from install-guide

These files are not used at all, let's remove them.

Change-Id: Iac4724d248b17cfb76c63a418ec44e121ab40958
Merge "Remove unused files from install-guide"
Merge "Updates about the resize and rebuild options for dashboard instances"