Merge pull request #63 from github-for-unity/fixes/doc-remove-environment-setup-file

Remove Environment Setup markdown

Author: StanleyGoldman

docs/contributing/setup.md

@@ -10,8 +10,6 @@ resources to get familiar with how things work:
 
  - **[How Can I Contribute?](../CONTRIBUTING.md#how-can-i-contribute)** -
     details about how you can participate
- - **[Development Environment Setup](contributing/setup.md)** - everything
-    you need to know to get Desktop up and running
  - **[How To Build](contributing/how-to-build.md)** - learn how to build the
     application
  - **[Style Guide](contributing/styleguide.md)** - notes on the coding style