📜 maintenance, add section on PRs

[lucasrodes]

• General maintenance
• Add a section on PRs and how we work with them.

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```diff Legend: +New ~Modified -Removed =Identical Details Hint: Run this locally with etl diff REMOTE data/ --include yourdataset --verbose --snippet ``` Automatically updated datasets matching _weekly_wildfires|excess_mortality|covid|fluid|flunet|country_profile|garden/ihme_gbd/2019/gbd_risk_ are not included

Edited: 2024-11-19 13:12:39 UTC Execution time: 14.72 seconds