Convert to our flask_mongoutils module
`from flask import current_app` -> `from flask import current_app as app`
(+ some minor cleanup)
Merge branch 'feature/refactoring' of https://github.com/local-projects/change-by-us-3 into feature/refactoring
Merge branch 'feature/refactoring' of https://github.com/local-projects/change-by-us-3 into feature/refactoring
Refactoring: mostly current_app as app and module path stuff.