Move to Poetry for deps and packaging

setup.py has been removed, and Poetry is now used to package for
install. This fixed an issue i had with uploading to PyPI, so one can
now run 'pip install jellyfin-accounts' to install.

jellyfin_accounts/setup.py

@@ -1,8 +1,8 @@
 from flask import request, jsonify, render_template
 from configparser import RawConfigParser
 from jellyfin_accounts.jf_api import Jellyfin
-from __main__ import config, config_path, app, first_run
-from __main__ import web_log as log
+from jellyfin_accounts import config, config_path, app, first_run
+from jellyfin_accounts import web_log as log
 import os
 
 if first_run: