Fix Configuration link in docs
Fix Configuration link in docs

The configuration link on the installation page was trying to
link to a local #configuration, we instead want it to reference
the configuration.html page.

Change-Id: Ie1d3bb7300902185e07aef91e58e403ca67981ba

seandst/nodepool,Tesora/tesora-nodepool,Tesora/tesora-nodepool,citrix-openstack/nodepool,citrix-openstack/nodepool,seandst/nodepool