Talk about local.conf first

We bury the lead with all the historical notes about localrc; just
talk about what is important to somebody setting up a current
devstack, which is local.conf.

There are already inline examples of config-variables, etc.  Remove
them, but add a small overview example for logging in its place.

Change-Id: I466252ffba66ef4ea180c9355f715a19eb4f8017
diff --git a/README.md b/README.md
index df0df91..ee7f0e7 100644
--- a/README.md
+++ b/README.md
@@ -77,30 +77,21 @@
 of your hypervisor of choice to reduce testing cycle times.  You might even save
 enough time to write one more feature before the next feature freeze...
 
-``stack.sh`` needs to have root access for a lot of tasks, but uses ``sudo``
-for all of those tasks.  However, it needs to be not-root for most of its
-work and for all of the OpenStack services.  ``stack.sh`` specifically
-does not run if started as root.
+``stack.sh`` needs to have root access for a lot of tasks, but uses
+``sudo`` for all of those tasks.  However, it needs to be not-root for
+most of its work and for all of the OpenStack services.  ``stack.sh``
+specifically does not run if started as root.
 
-This is a recent change (Oct 2013) from the previous behaviour of
-automatically creating a ``stack`` user.  Automatically creating
-user accounts is not the right response to running as root, so
-that bit is now an explicit step using ``tools/create-stack-user.sh``.
-Run that (as root!) or just check it out to see what DevStack's
-expectations are for the account it runs under.  Many people simply
-use their usual login (the default 'ubuntu' login on a UEC image
-for example).
+DevStack will not automatically create the user, but provides a helper
+script in ``tools/create-stack-user.sh``.  Run that (as root!) or just
+check it out to see what DevStack's expectations are for the account
+it runs under.  Many people simply use their usual login (the default
+'ubuntu' login on a UEC image for example).
 
 # Customizing
 
-You can override environment variables used in `stack.sh` by creating
-file name `local.conf` with a ``localrc`` section as shown below.  It
-is likely that you will need to do this to tweak several settings for
-your environment.
-
-    [[local|localrc]]
-    VARIABLE=value
-
-Start by reading the [configuration
-guide](doc/source/configuration.rst) for details of the many available
-options.
\ No newline at end of file
+DevStack can be extensively configured via the configuration file
+`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](doc/source/configuration.rst) for
+details of the configuration file and the many available options.
\ No newline at end of file