mgt doc updates

backend/README.md.backup

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+## Workflow:
+- should work with flask run and dockerfile build
+- local dev
+- local pip install
+- record versionless pips manually here
+- pip freeze snapshots into project requirements
+- docker build copies frozen requirements
+
+
+## pip:
+```
+pip install flask
+pip install python-dotenv
+pip install flask-wtf
+pip install flask-sqlalchemy
+pip install flask-migrate
+pip install flask-login
+pip install email-validator
+
+pip freeze > requirements.txt
+```
+
+## db cheat:
+```
+flask db migrate -m "users table"
+flask db upgrade
+
+flask db downgrade [base]
+flask db upgrade
+```
+## build:
+
+Dockerfile needs explicitly defined copies for:
+- app
+- config
+- project dir
+- requirements
+
+## notes:
+- environment comes through project env passes through compose
+- keep env untracked but templated
+- no dotenv here, dotflaskenv goes into image