Revert the setup.cfg infra and go back to requirements.txt

I've continually run into problems with the setup.cfg route that I'm not
interested in investing the time to debug and fix. Looking around it doesn't
seem to be very common yet so I've had a hard time finding help/docs etc.

script/bootstrap

@@ -19,10 +19,11 @@ if [ ! -d "$VENV_NAME" ]; then
 fi
 . "$VENV_NAME/bin/activate"
 
-pip install -e .
+pip install -U pip
+pip install -r requirements.txt
 
 if [ "$ENV" != "production" ]; then
-    pip install -e .[dev,test]
+    pip install -r requirements-dev.txt
 fi
 
 if [ ! -L ".git/hooks/pre-commit" ]; then