How to do it...

1. Verify that Ruby is preinstalled, and Jekyll is not:

      which ruby; which jekyll

This command will return only the location of Ruby on your VM. Thus, Jekyll needs to be installed.

1. To install Jekyll, you need to install Bundler first:

      gem install bundler

1. Now run bundle install, which will install Jekyll:

      bundle install

1. Verify that Jekyll is installed:

      bundle show jekyll

1. Serve Bootstrap 4 Jekyll-powered docs on Cloud9 IDE:

      bundle exec jekyll serve --host $IP --port $PORT --baseurl ''

Upon running this command, a notification will pop up with a link to preview the running webpage. Click on the link and choose one of the display options:

1. Click on the link, and your very own copy of the Bootstrap docs will appear: