Update developers info.

Change main wiki to the github wiki.

doc/developers/index.rst

@@ -50,7 +50,7 @@ repository on
 `github <http://github.com/scikit-learn/scikit-learn/>`__:
 
  1. `Create an account <https://github.com/signup/free>`_ on 
-    github
+    github if you don't have one already.
  
  2. Fork the `scikit-learn repo
     <http://github.com/scikit-learn/scikit-learn>`__: click on the 'Fork'
@@ -100,13 +100,6 @@ Roadmap
 will find a detailed roadmap, with a description on what's planned to
 be implemented in the following releases.
 
-.. _packaging:
-
-Packaging
-----------
-
-You can also help making binary distributions for windows, OsX or packages for some
-distribution.
 
 Documentation
 ----------------------
@@ -116,7 +109,8 @@ rst docs (like this one), tutorials, etc. Rst docs live in the source
 code repository, under directory doc/.
 
 You can edit them using any text editor and generate the html docs by
-typing ``make html`` from the doc/ directory. That should create a
+typing from the doc/ directory ``make html`` (or ``make html-noplot``,
+see README in that directory for more info). That should create a
 directory _build/html/ with html files that are viewable in a web
 browser.
 
@@ -124,9 +118,8 @@ browser.
 Developers web site
 ----------------------
 
-More information can be found at the developer's web site:
-http://sourceforge.net/apps/trac/scikit-learn/wiki , which contains a
-wiki, an issue tracker, and a Roadmap
+More information can be found at the `developer's wiki
+<https://github.com/scikit-learn/scikit-learn/wiki>`_.
 
 .. _coding-guidelines: