Reorganize tasks and add ui server-related tasks. now it looks like the following
$ poetry run inv -l
Available tasks:
api.init-poetry-env Initialize the ask-astro API server local poetry environment
api.run-with-docker Run ask-astro API server with docker
api.run-with-poetry Run ask-astro API server with poetry
api.stop-container Stop ask-astro API server container
docs.build Build sphinx docs
docs.serve Serve the docs locally (http://127.0.0.1:8000)
ui.init Initialize UI server dependencies
ui.run Run UI server
fix #45