FYI: If you can access the website on your phone (I'm assuming you can since you made this comment), you can make small edits like this from there. Navigate to your repo, click on the ".gitignore" file, select the 3 dots to the right, and click "edit in place". You can then add the line and make the commit. But note that this will not remove the __pycache__ file from the repo, though you can also perform that from your browser through a similar process.
