Point setup instructions to the README

Add instructions for combining/minifying static assets

Update workflow overview architecture docs

Update AI grading architecture docs

Use napoleon keyword argument instead of kwargs

Fix example usage docstrings in AI API

And clean up requirements files

Moved workflow errors into a separate module.

Move openassessment out of the apps directory
Use pkg_resources to check whether OA XBlock is installed.

ORA2 Developer Doc - file cleanup

Updated path in conf.py file