Purge README.rst in favor of the generated documentation
Purge README.rst in favor of the generated documentation

Change-Id: I805f680a48730da4698eb56032c5d2f74a7ca7d7
Closes-bug: #1735690
Signed-off-by: Vitalii Solodilov <9b6dd6fe1f803b14c20e33ea5e7c8cb4581e2919@yandex.ru>

openstack/mistral,openstack/mistral