Well, if the text file uses git(hub/lab) flavored markdown, you can check/uncheck the boxes from the webui of git(hub/lab). No need to write an app for the apple device.
https://docs.gitlab.com/ee/user/markdown.html#task-lists
In gitlab you might need to edit the markdown file via an webeditor and create a commit this way.
Raze the whole suburbia to the ground and rebuild it with proper pedestrian, bike and public transportation, mixed zoning in mind. There is no saving or improving it, it is just too far gone.