Draft: install required dependency

When using bundle install before, I got this error. Dependency Error: Yikes! It looks like you don't have kramdown-parser-gfm or one of its dependencies installed. In order to use Jekyll as currently configured, you'll need to install this gem. The full error message from Ruby is: 'cannot load such file -- kramdown-parser-gfm' If you run into trouble, you can find helpful resources at https://jekyllrb.com/help/! Liquid Exception: kramdown-parser-gfm in /_layouts/default.html This adds the kramdown parser.