reorganize contributing into development section

docs/development/index.rst

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+Development
+===========
+As an open source project, ``cryptography`` welcomes contributions of all
+forms. The sections below will help you get started.
+
+File bugs and feature requests on our issue tracker on `GitHub`_. If it is a
+bug check out `what to put in your bug report`_.
+
+.. toctree::
+    :maxdepth: 2
+
+    getting-started
+    submitting-patches
+    reviewing-patches
+
+.. _`GitHub`: https://github.com/pyca/cryptography
+.. _`what to put in your bug report`: http://www.contribution-guide.org/#what-to-put-in-your-bug-report