AgnostiqHQ/covalent: v0.27.3

[0.27.3] - 2022-02-25 Added Added USING_DOCKER.md guide for running docker container. Added cli args to covalent UI flask server covalent_ui/app.py to modify port and log file path. Removed Removed gunicorn from cli and Dockerfile. Changed Updated cli covalent_dispatcher/_cli/service.py to run flask server directly, and removed dispatcher and UI flags. Using Flask blueprints to merge Dispatcher and UI servers. Updated Dockerfile to run flask server directly. Creating server PID file manually in covalent_dispatcher/_cli/service.py. Updated tests and docs to reflect merged servers. Changed all mentions of port 47007 (for old UI server) to 48008