Update `config.yaml` loading

[btobers]

In regards to PyGEM PR #78, update the loading of the configuration file in each notebook.

In the advanced_test_tw.ipynb, programmatically update the config include_frontalablation key so that the notebook can be run straight through and added as another test for PyGEM.

• Update loading of config.yaml in each notebook
• Programmatically update include_frontalablation key in advanced_test_tw