Remove global conda environment file

Author: gjbex

README.md

@@ -10,12 +10,16 @@ For information on the training, see the website
 
 1. [`source-code`](source-code): sample code written to develop the slides and
    illustrate concepts.
-1. [`environment.yml`](environment.yml): conda environment file intended to be
-   cross-platform.
 1. [`python_on_gpus_science_linux64_conda_specs.txt`](python_on_gpus_linux64_conda_specs.txt):
    conda environment specification file specific for 64-bit Linux to precisely
    reproduce the environment on which the code was developed.
 1. [License](LICENSE): license information for the material in this repository.
 1. [Contributing](CONTRIBUTING.md): information on how to contribute to this
    repository.
 1. docs: directory containing the website for this repository.
+
+
+## Environment setup
+
+Each of the subdirectories of the `source-code` directory contains an `environment.yml`
+file that can be used to create a conda environment with the necessary packages.