Adapt watcher documentation for new standards

This patch set makes the following changes:

 * Add index file to each subdirectory of doc/source
 * Update doc/source/index.rst with new links
 * Move content of install-guide to the doc/source/install
 * Minor changes

Depends-On: Ifc5512c0e2373cf3387e0e0498268eab092e52bb
Change-Id: Iecb4f60efb015a56b9b37331859848b287112842

doc/source/install/install-rdo.rst

@@ -0,0 +1,38 @@
+.. _install-rdo:
+
+Install and configure for Red Hat Enterprise Linux and CentOS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+
+This section describes how to install and configure the Infrastructure
+Optimization service for Red Hat Enterprise Linux 7 and CentOS 7.
+
+.. include:: common_prerequisites.rst
+
+Install and configure components
+--------------------------------
+
+1. Install the packages:
+
+   .. code-block:: console
+
+      # sudo yum install openstack-watcher-api openstack-watcher-applier \
+        openstack-watcher-decision-engine
+
+.. include:: common_configure.rst
+
+Finalize installation
+---------------------
+
+Start the Infrastructure Optimization services and configure them to start when
+the system boots:
+
+.. code-block:: console
+
+   # systemctl enable openstack-watcher-api.service \
+     openstack-watcher-decision-engine.service \
+     openstack-watcher-applier.service
+
+   # systemctl start openstack-watcher-api.service \
+     openstack-watcher-decision-engine.service \
+     openstack-watcher-applier.service