docs(using_deis): remove deis builds reference

this reference exists in #1327 which as of this writing is not merged
yet.

Author: Matthew Fisher

docs/using_deis/deploy-application.rst

@@ -52,8 +52,6 @@ Deploying a Docker image onto Deis allows you to take a Docker image from either
 or a private registry and copy it over bit-for-bit, ensuring that you are running the same
 image in development or in your CI pipeline as you are in production.
 
-Learn how to deploy applications on Deis using :ref:`deis_builds`.
-
 
 .. _`twelve-factor methodology`: http://12factor.net/
 .. _`Heroku Buildpacks`: https://devcenter.heroku.com/articles/buildpacks