Refactor many aspects of the code to make it cleaner and more readable

brian_dashboard_manager/__init__.py

brian_dashboard_manager/config.py

brian_dashboard_manager/data.py

brian_dashboard_manager/exception.py

brian_dashboard_manager/grafana/__init__.py

brian_dashboard_manager/grafana/dashboard.py

brian_dashboard_manager/grafana/datasource.py

brian_dashboard_manager/grafana/folder.py

brian_dashboard_manager/grafana/organization.py

brian_dashboard_manager/grafana/provision.py

brian_dashboard_manager/grafana/request.py

brian_dashboard_manager/inventory_provider/__init__.py

brian_dashboard_manager/provision/__init__.py

brian_dashboard_manager/provision/eumetsat.py

brian_dashboard_manager/provision/helpers.py

brian_dashboard_manager/provision/homedashboard.py

brian_dashboard_manager/provision/organization.py

brian_dashboard_manager/provision/render.py

brian_dashboard_manager/provision/strategies.py

brian_dashboard_manager/routes/update.py