# install
$ brew install ruby
$ sudo gem update --system 
$ sudo bundle install
$ sudo gem uninstall google-protobuf
$ sudo gem install google-protobuf -v 3.23.4 --platform=ruby
$ sudo gem uninstall kramdown-parser-gfm
$ sudo gem install kramdown-parser-gfm -v 1.1.0 --platform=ruby

# build
$ bundle exec jekyll build

# serve
$ bundle exec jekyll serve --livereload

# install
$ sudo apt install ruby ruby-dev gem
$ sudo gem update --system 
$ sudo bundle install
$ sudo gem uninstall google-protobuf
$ sudo gem install google-protobuf -v 3.23.4 --platform=ruby

# build
$ bundle exec jekyll build

# serve
$ bundle exec jekyll serve --livereload