Prevent submodules, .git subdirectories

[nadavoid]

Sometimes composer does a git checkout to get the code it needs. When it does so, the .git directory remains. When switching to git mode and committing the updates on pantheon, these packages are (partially?) added as submodules.

This shell command gets close:
find . | grep "\.git" | xargs rm -rf
but may delete too much, like .gitignore, .gitattributes, etc.

[nadavoid]

find . -mindepth 2 -type d -name .git | grep "\.git" | xargs rm -rf seems to work better (via Dustin LeBlanc in the Pantheon's #power-users slack).