Reorganize repository

We should have two/three folders in dan/ to orgnaize the code more cleanly.

changed milestone to %ML Prod - Summer 2023

added P1 Quick Win labels

assigned to @yschneider

changed milestone to %DAN-P5: Improve training

mentioned in merge request !239 (merged)

added P2 label and removed P1 label

closed with merge request !239 (merged)