This patch moves the tables describing configuration options for each
server type from the deployment_guide.rst doc to separate per-server
documents. The new per-server documents are grouped under a config
directory with a config index doc. The config index doc is listed in
the top level index and provides a single starting point to navigate
to the individual server docs.
Change-Id: I6cedd98586febb5dc949c088ee44e160385ed324