Write documentation for app and controller configuration

[djbpitt]

Your to-do

1a. Review existing documentation and create guiding goals/anti-goals to inform approach and style

1. Write documentation for general app set-up
2. Write documentation for controller configuration within app
3. Collect links to XQuery and eXist-db external documentation

Issues you may encounter

1. Older documentation is too long and wordy, with too many steps, each of which is too long. Some of the information may also no longer be current.
2. Need to figure out how to test and debug controller configuration.

Additional context