init script: create link for .wokeignore

[ru-fu]

When running woke locally, the .wokeignore file must be in the folder where you run it (for example, the docs folder). When runnin on GitHub, we run woke from the root folder though, and it cannot deal with a .wokeignore file in a subdirectory. Therefore, have the script create a symlink (unless there already is a .wokeignore file in the root folder).

[pmatulis]

And don't we need to make an analogous change in the manual steps?

[ru-fu]

Thanks for the review @pmatulis ! Updated now.