Delete all existing .DS_Store and Icon? to provent Git from tracking the undesired files.

find . -name .DS_Store -print0 | xargs -0 git rm -f --ignore-unmatch

find . -name "Icon?" -print0 | xargs -0 git rm -f --ignore-unmatch

Modiy the .gitignore file to ignore files and directory in all subdirectories.

.DS_Store
node_modules/
_book/
Icon?

Commit and then push.