docs(envvars): Automatically update environment files

[samoehlert]

Closes #81

This includes:

• a script to parse environment variables (a bit of a nasty regex, I'm not sure how else to do it)
• associated tests
• the docs themselves
• convenience Makefile target
• precommit hook that runs the Makefile target so each commit theoretically has the latest variable CRUDs
• finally precommit was upset at me for not having the python-version

Also ruff formatting changed a couple of whitespace things, whatever.

[github-actions]

Pytest Celery Scheduler Coverage

File	Coverage
All files	100%	✅

Minimum allowed coverage is 80%

Generated by 🐒 cobertura-action against ae2e8c6

[github-actions]

Django Pytest/Behave Coverage

File	Coverage
All files	78%	✅
config/consumers.py	60%	✅
config/urls.py	69%	✅
config/settings/base.py	69%	✅
config/settings/local.py	72%	✅
scram/route_manager/admin.py	71%	✅
scram/route_manager/models.py	79%	✅
scram/route_manager/views.py	88%	✅
scram/route_manager/api/serializers.py	92%	✅
scram/route_manager/api/views.py	63%	✅
scram/shared/shared_code.py	56%	✅
scram/templates/403.html	91%	✅
scram/templates/404.html	91%	✅
scram/templates/base.html	99%	✅

Minimum allowed coverage is 50%

Generated by 🐒 cobertura-action against ae2e8c6

[crankynetman]

Looks great, just a few comments, mostly minor stuff. Nicely done, this is going to be a huge help for QoL.

[crankynetman]

Looks awesome, well done!