You must have ruby version > 2.4
I set up a gemfile so you should be able to just bundle install
or
gem install jekyll -v 3.8
gem install jekyll-paginate
gem install jekyll-gist
gem install redcarpet
gem install pygments.rb
jekyll serve
goes to http://localhost:4000/
git push heroku master will deploy to: https://afuturedate.herokuapp.com/
jekyll and hyde