Add Python 3.12 support

Replace black and flake8 with ruff

Fix init command that still requires args

Remove username and email completely

Bulk delete todos in case a file gets removed

Add a command for todo discovery in a single file

Bump up setup.py version

Bumping up setup.py version to 0.2.3

Load Notter instance if it already exists

Fix TODO discovery bug

Add export functionality

Discover and save only comments of type TODO

Add logo to readme

Mark a comment as todo only if it starts with one of the specific tags

Rely on user input for source folder, remove multiprocessing