[FEAT] Improve troubleshooting experience for users in the UI

[mikejgray]

          Built and tested this. I do get the config populated now, but hit permissions errors:

PermissionError: [Errno 13] Permission denied: '/home/neon/.config/neon/neon.yaml'

This is almost certainly because I'm running this as d_mcknight but the installer runs the other containers as neon, so this will likely be fixed when this container is included with the installer. Consider adding the error message to the Web UI though; I only see a generic "Failed to save Neon configuration" message there, and the actual exception might help with user bug reports.

Originally posted by @NeonDaniel in #8 (comment)

Directly dumping the Python traceback into the UI is probably not a great plan, from a security and usability perspective, but a troubleshooting feature or a button to gather information may be useful.