rearrange existing docs to fit the new standard layout

Refer to
https://specs.openstack.org/openstack/docs-specs/specs/pike/os-manuals-migration.html
for details.

Change-Id: I10a07ae0b419730960d7d1013ace259dab7a2455

doc/source/contributing.rst

@@ -1,4 +0,0 @@
-============
-Contributing
-============
-.. include:: ../../CONTRIBUTING.rst

doc/source/contributor/index.rst

@@ -0,0 +1,5 @@
+============
+Contributing
+============
+
+.. include:: ../../../CONTRIBUTING.rst

doc/source/index.rst

@@ -1,20 +1,18 @@
-.. python-cloudkittyclient documentation master file, created by
-   sphinx-quickstart on Tue Jul  9 22:26:36 2013.
-   You can adapt this file completely to your liking, but it should at least
-   contain the root `toctree` directive.
-
+========================================================
 Welcome to python-cloudkittyclient's documentation!
 ========================================================
 
+This is a client library for CloudKitty built on the CloudKitty API. It
+provides a Python API (the ``cloudkittyclient`` module).
+
 Contents:
 
 .. toctree::
    :maxdepth: 2
 
-   readme
-   installation
-   usage
-   contributing
+   install/index
+   user/index
+   contributor/index
 
 Indices and tables
 ==================

doc/source/readme.rst

@@ -1 +0,0 @@
-.. include:: ../../README.rst