Remove documented parts from README

A few commits with the official documentation has been already
merged so let's remove the duplicated content from the README.

Change-Id: I8d9e367e81e22eae0ab1068bd8526437e63ce1c8
Story: 2002703
Task: 22670

README.rst

@@ -8,103 +8,7 @@ python-tempestconf will automatically generate the tempest configuration
 based on your cloud.
 
 -  Free software: Apache license
--  Documentation:
-   http://git.openstack.org/cgit/openstack/python-tempestconf/tree/README.rst
+-  Documentation: https://docs.openstack.org/python-tempestconf/latest/
 -  Source: https://git.openstack.org/openstack/python-tempestconf
 -  Bugs: https://storyboard.openstack.org/#!/project/912
 -  Release notes: https://docs.openstack.org/releasenotes/python-tempestconf
-
-Usage
------
-
-Git
-~~~
-
-1. Clone and change to the directory:
-
-.. code-block:: shell-session
-
-    $ git clone https://git.openstack.org/openstack/python-tempestconf
-    $ cd python-tempestconf
-
-2. Create virtual environment using virtualenv:
-
-.. code-block:: shell-session
-
-    $ virtualenv .venv
-    $ source .venv/bin/activate
-
-3. Source the newly created virtual environment and install
-   requirements:
-
-.. code-block:: shell-session
-
-    (.venv) $ pip install -r requirements.txt
-    (.venv) $ pip install -r test-requirements.txt
-
-4. Source cloud credentials, for example:
-
-.. code-block:: shell-session
-
-    (py27) $ source cloudrc
-
-5. Run python-tempestconf to generate tempest configuration file:
-
-.. code-block:: shell-session
-
-    (py27) $ python config_tempest/config_tempest.py --debug identity.uri $OS_AUTH_URL \
-                identity.admin_password  $OS_PASSWORD --create
-
-After this, ``./etc/tempest.conf`` is generated.
-
-RPM Installation (RDO)
-~~~~~~~~~~~~~~~~~~~~~~
-
-1. python-tempestconf is installed together with openstack-tempest, as
-   a new dependency (starting from the Ocata release)
-
-.. code-block:: shell-session
-
-    # yum install openstack-tempest
-
-2. Source cloud credentials, initialize tempest and run the discovery
-   tool:
-
-.. code-block:: shell-session
-
-    $ source cloudrc
-    $ tempest init testingdir
-    $ cd testingdir
-    $ discover-tempest-config --debug identity.uri $OS_AUTH_URL \
-          identity.admin_password  $OS_PASSWORD --create
-
-.. note::
-   In Ocata release new features were presented.
-   ``discover-tempest-config`` is the new name of the **old**
-   ``config_tempest.py`` script and it **accepts the same parameters.**
-   More about new features can be found
-   `here <https://blogs.rdoproject.org/2017/02/testing-rdo-with-tempest-new-features-in-ocata/>`__
-
-
-os-client-config support
-~~~~~~~~~~~~~~~~~~~~~~~~
-
-python-tempestconf supports `os-client-config <https://git.openstack.org/openstack/os-client-config>`__
-so instead of sourcing openstackrc files you can use clouds.yml files. Location where
-these files should be stored and syntax which is used to specify cloud.yaml files
-can be found `here <https://docs.openstack.org/os-client-config/latest/user/configuration.html#config-files>`__
-
-In case of git usage:
-
-.. code-block:: shell-session
-
-    (py27) $ python config_tempest/config_tempest.py --debug --create --os-cloud <name of cloud>
-
-In case of RPM:
-
-.. code-block:: shell-session
-
-    $ tempest init testingdir
-    $ cd testingdir
-    $ discover-tempest-config --debug --create --os-cloud <name of cloud>
-