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-ubuntu.rst

@@ -0,0 +1,34 @@
+.. _install-ubuntu:
+
+Install and configure for Ubuntu
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This section describes how to install and configure the Infrastructure
+Optimization service for Ubuntu 14.04 (LTS).
+
+.. include:: common_prerequisites.rst
+
+Install and configure components
+--------------------------------
+
+1. Install the packages:
+
+   .. code-block:: console
+
+      # apt install watcher-api watcher-decision-engine \
+        watcher-applier
+
+      # apt install python-watcherclient
+
+.. include:: common_configure.rst
+
+Finalize installation
+---------------------
+
+Restart the Infrastructure Optimization services:
+
+.. code-block:: console
+
+   # service watcher-api restart
+   # service watcher-decision-engine restart
+   # service watcher-applier restart