fix(quickstart): fix link to buildpack documentation

Author: Joshua Anderson

src/quickstart/deploy-an-app.md

@@ -104,5 +104,5 @@ more you can do with Deis Workflow, play around with the CLI:
     * [deis/example-ruby-sinatra](https://github.com/deis/example-ruby-sinatra)
     * [deis/example-nodejs-express](https://github.com/deis/example-nodejs-express)
     * [deis/example-java-jetty](https://github.com/deis/example-java-jetty)
-* Read about using application [Buildpacks](../../applications/using-buildpacks) or [Dockerfiles](../applications/using-dockerfiles.md)
+* Read about using application [Buildpacks](../applications/using-buildpacks.md) or [Dockerfiles](../applications/using-dockerfiles.md)
 * Join our [#community slack channel](https://slack.deis.io) and meet the team!