Refactored documentation.

doc/contributing.rst

@@ -1,4 +1,30 @@
-Rules
-=================
+#################
+How to contribute
+#################
 
-.. include:: ../CONTRIBUTING.rst
+Contributions are always welcome but please try to follow those few rules:
+
+- Modoboa tries to respect the `PEP8 <https://www.python.org/dev/peps/pep-0008/>`_
+
+- If you add some code, add some tests too. You can run the tests
+  suite locally by using `tox <https://testrun.org/tox/latest/config.html>`_
+
+There are also a few commands that can help you to contribute:
+
+Start a basic Modoboa instance with a few fixture::
+
+   $ tox -e serve
+
+You can log in with admin/password.
+
+Build the docs to see your changes::
+
+   $ tox -e doc
+   $ firefox .tox/doc/tmp/html/index.html
+
+
+.. toctree::
+
+   contributing/getting_started
+   contributing/plugin_api
+   contributing/events