correct nb link

Author: dacoex

docs/sphinx/source/index.rst

@@ -38,7 +38,7 @@ Please see our
 `PVSC 2014 paper <http://energy.sandia.gov/wp/wp-content/gallery/uploads/PV_LIB_Python_final_SAND2014-18444C.pdf>`_
 and
 `PVSC 2015 abstract <http://energy.sandia.gov/about/publications/download-info/pvlib-python-2015/>`_ 
-(and the `notebook to reproduce the figures therein <https://github.com/pvlib/pvsc2015>`_) for more information.
+(and the `notebook to reproduce the figures <http://nbviewer.ipython.org/github/pvlib/pvsc2015/blob/master/paper.ipynb>`_) therein for more information.
 
 Installation
 ============