Reorganize models

[bmtcril]

Originally we had hoped to maintain our schemas such that:

• event_sink and xapi schemas store incoming raw data or 1st level materialized views that don't transform the data (ex: enrollment_events)
• reporting stored the remaining materialized views, dictionaries, and views

We've not been following that and now there is really no order to where things are going. We should:

1. Look at the dbt docs for an out of the box instance
2. Remove any unused models
3. Move the schema for any models that don't match the criteria above
4. Script removal of the old locations of those models to prevent future confusion