Add hot reloading

[c-w]

The project used to have hot reloading of Python and Javascript code in Docker containers via watchmedo and react-scripts combined with docker-compose volume mounts.

lokole/docker/docker-entrypoint-dev.sh

Lines 9 to 15 in b114e82

	exec "${PY_ENV}/bin/watchmedo" \
	auto-restart \
	--debug-force-polling \
	--directory="${rootdir}/opwen_email_server" \
	--pattern='*.py' \
	--recursive \
	-- "$@"

lokole/docker/docker-compose.dev.yml

Lines 23 to 26 in b114e82

	webapp:
	volumes:
	- ./opwen_email_client:/app/opwen_email_client
	- ./opwen_email_server:/app/opwen_email_server

In #426 we had to remove hot reloading since volume mounting was causing issues with files disappearing inside of the container. We want to find a way to bring back hot reloading without affecting the stability of the docker system.