Remove outdate scikit-cuda

Author: gjbex

source-code/README.md

@@ -6,7 +6,5 @@ Sample code for performing computations on a GPU.
 ## What is it?
 
 1. `pycuda`: directory illustrating pyCUDA.
-1. `scikit_cuda`: code illustrating linear algebra on a GPU device.  This is an
-   older library and has been at least partially superceded by CuPy.
 1. `numba`: code illustrating using numba for GPU computing.
 1. `cupy`: Jupyter notebook illustrating some aspects of the `cupy` package.