cd site
bundle install
bundle exec jekyll serve
Site runs at http://localhost:4000.
Reset local bundle state and reinstall:
cd site
rm -f Gemfile.lock
rm -rf .bundle vendor/bundle
bundle install
bundle exec jekyll serve
Could not find minimal-mistakes-jekyll-4.27.3Could not find 'bundler' (...) required by Gemfile.lockBoth are usually resolved by the reset steps above.