Fixed dead wiki links

Author: HangenYuu

doc/introduction.rst

@@ -157,7 +157,7 @@ to extend PyTensor, please feel free to ask.
    install
    tutorial/index
 
-.. _LISA:  https://mila.umontreal.ca/
+.. _LISA:  https://mila.quebec/en
 .. _Greek mathematician: http://en.wikipedia.org/wiki/Theano_(mathematician)
 .. _numpy: http://numpy.scipy.org/
 .. _BLAS: http://en.wikipedia.org/wiki/Basic_Linear_Algebra_Subprograms