Fix a handful of bugs from previous tasks

SBassettrequested to merge
T383741-misc-cleanup into main

This merge request:

  • Fixes a lingering formatting issue in usd_api/models.py

  • Changes max-lengths for char variables in usd_api/models.py to 255 (after a warning from Django)

  • Adds pymysql as alternative to mysqlclient to pyproject.toml as a dependency (w/ updated lock file)

  • Runs poetry install and createsuperuser explicitly within the docker-compose.yml

  • Adds some development environment notes to README.md

  • Adds */migrations/ dirs to .gitignore

Bug: T383741

Closes T383741

Edited by SBassett

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