submoduleを普通のディレクトリに戻す

How to un-submodule a Git submodule? - Stack Overflow

$ git rm --cached submodule_path # delete reference to submodule HEAD (no trailing slash)
$ git rm .gitmodules             # if you have more than one submodules,
                               # you need to edit this file instead of deleting!
$ rm -rf submodule_path/.git     # make sure you have backup!!
$ git add submodule_path         # will add files instead of commit reference
$ git commit -m "remove submodule"