* CI runtime decreased by 70-80%
* docker-compose setup time decreased significantly. **Local use: takes a few seconds as opposed to a few minutes before**. Airflow Variables and Connections are loaded via `import` CLI command; replaces `bin/run` script using Airflow CLI.
* Improved dev secrets security by dynamically generating a Fernet key in makefile
* `.env` file is generated from `make up`, contains UID and Fernet key. `.env` is automatically loaded into environment variables by `docker-compose`
* Retire shell scripts to use builtin features in our stack
* `bin/run` replaced by docker-compose and CI
* `bin/test-dag-tags` replaced by pytest unit tests
* `bin/test-parse` replaced by pytest unit tests
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