Resolve "Update extractor information in the handbook (data team)"
Issue
Closes #3596 (closed)
Solution
This MR:
- updates the data team's page in the handbook to represent the current state of extractor responsibility
- codifies the responsibility for pipelines, as discussed on 12/12/18
- updates references to our data warehouse now that Looker is pointing at Snowflake
Edited by Emilie Schario