Update URLs

Some URLs are broken, so fix them.
The others are redirect to new URLs,
so replace them with new ones.

The config options of nova serial console proxy
have been gathered in nova/conf/serial_console.py.
So the description in doc/source/guides/nova.rst
is fixed.

Change-Id: Ifd81cc09969341fbf8f135a913fc6003b94e0acc
diff --git a/README.rst b/README.rst
index b4240bd..adbf59a 100644
--- a/README.rst
+++ b/README.rst
@@ -14,7 +14,7 @@
 * To provide an environment for the OpenStack CI testing on every commit
   to the projects
 
-Read more at http://docs.openstack.org/developer/devstack
+Read more at https://docs.openstack.org/devstack/latest
 
 IMPORTANT: Be sure to carefully read `stack.sh` and any other scripts you
 execute before you run them, as they install software and will alter your
@@ -92,5 +92,5 @@
 `local.conf`.  It is likely that you will need to provide and modify
 this file if you want anything other than the most basic setup.  Start
 by reading the `configuration guide
-<https://docs.openstack.org/developer/devstack/configuration.html>`_
+<https://docs.openstack.org/devstack/latest/configuration.html>`_
 for details of the configuration file and the many available options.