Cannot remove submodule from Git repo
This question already has an answer here:
 If the git submodule deinit fails (maybe because the .gitmodules doesn't list that submodule), try to remove at least the special entry in the index:  
git rm --cached submodule-name
git commit -m "Remove submodule entry"
git push
The gray folder should then be gone on GitHub side.
这工作https://stackoverflow.com/a/1789374/1798394:
git rm --cached path/to/submodule
rm -rf path/to/submodule
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