python: rename Example Satellite

Noticed in the example config, see !349 (comment 1040106)

• Removes Satellite from the class name (if it is found, otherwise does nothing)
• Renames Example_Satellite to ExampleSatellite Mariner
• Deletes the example config in configs (we have what works in the docs, so let's go from there)
• Updates the docs to use --no-build-isolation for pip install (otherwise install is bodged if venv ninja is used)
• Improves exception handling and error reporting in do_initialize; this required a change to the type of exception being thrown in the Configuration class
• Extends the Mariner example class and adds tests