-- initialize submodule configuration
git submodule init 
-- update your submodule --remote fetches new commits in the submodules
-- and updates the working tree to the commit described by the branch
git submodule update --remote

git submodule deinit themes/hugo-future-imperfect-slim
git rm themes/hugo-future-imperfect-slim
git commit -m "Removed submodule "
rm -rf .git/modules/themes/hugo-future-imperfect-slim/

git submodule add https://github.com/satyapavan/hugo-future-imperfect-slim-local-copy.git hugo-future-imperfect-slim/