Move link to BUILD.md to README.md

Most people contributing to the project do not need to build an RPM, so
it can be left out of the Contribution Guide.

Placing it in the README for still some visibility.

CONTRIBUTING.md

@@ -66,10 +66,6 @@ These are plugins used in playbooks and roles:
 └── test                Contains tests.
 ```
 
-## Building openshift-ansible RPMs and container images
-
-See the [build instructions in BUILD.md](BUILD.md).
-
 ## Running tests
 
 We use [tox](http://readthedocs.org/docs/tox/) to manage virtualenvs and run

README.md

@@ -83,7 +83,10 @@ See [README_CONTAINER_IMAGE.md](README_CONTAINER_IMAGE.md) for information on ho
 
 See the [hooks documentation](HOOKS.md).
 
-
 ## Contributing
 
 See the [contribution guide](CONTRIBUTING.md).
+
+## Building openshift-ansible RPMs and container images
+
+See the [build instructions](BUILD.md).