[Docs] Test Configurations examples have wrong paths

[ethman]

Examples in Test Configurations page show that you should set CAQE_CONFIG='../test_configurations/general_mushra.cfg' as a path, but CAQE builds this path in __init__.py, so the examples should be CAQE_CONFIG='general_mushra.cfg' instead.

[ethman]

The examples on this page: https://interactiveaudiolab.github.io/CAQE/test_configurations.html are wrong. For example, for general MUSHRA that page says:
$ export CAQE_CONFIG='../test_configurations/general_mushra.cfg'

but line 24 in caqe/__init__.py does this:

app.config.from_pyfile('../test_configurations/' + os.getenv('CAQE_CONFIG', 'general_mushra.cfg'))