[MRG] Default pygment color for doc (#335)

* back to default pygment

* add images back

* move static images and make it work

Author: rflamary

docs/source/_static/images/bak.png

@@ -141,7 +141,7 @@ def __getattr__(cls, name):
 #show_authors = False
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = 'default'
 
 # A list of ignored prefixes for module index sorting.
 #modindex_common_prefix = []

docs/source/_static/images/sinkhorn.png

@@ -58,7 +58,7 @@
 # number of Bakeries to Cafés in a City (in this case Manhattan). We did a
 # quick google map search in Manhattan for bakeries and Cafés:
 #
-# .. image:: images/bak.png
+# .. image:: ../_static/images/bak.png
 #     :align: center
 #     :alt: bakery-cafe-manhattan
 #     :width: 600px
@@ -233,7 +233,7 @@
 # The Sinkhorn algorithm is very simple to code. You can implement it directly
 # using the following pseudo-code
 #
-# .. image:: images/sinkhorn.png
+# .. image:: ../_static/images/sinkhorn.png
 #     :align: center
 #     :alt: Sinkhorn algorithm
 #     :width: 440px