Better encapsulate configuration and paths to analysis components

[peabody124]

Currently set paths to analysis tools in:

https://github.com/peabody124/PosePipeline/blob/main/pose_pipeline/env.py#L26

And path to data storage in:

https://github.com/peabody124/PosePipeline/blob/main/pose_pipeline/pipeline.py#L19

The later should be set with the other DataJoint configuration settings, rather than the pipeline. The former is a bit trickier, and perhaps should even mimic the DataJoint approach for storage a package-specific configuration file on disk. This should also work well with a Docker version of the pipeline (e.g. #1).

[peabody124]

8724b0e addresses the storage configuration issue. Still need to handle the environment variables better.