Gemfile

source "https://rubygems.org"

# to publish on github page
gem 'github-pages', group: :jekyll_plugins

# to publish without github page
# gem 'jekyll', '=4.2.2'

group :jekyll_plugins do
    gem 'jekyll-sitemap', '>=1.4.0'

    # Not used, explicit feed.xml.
    gem 'jekyll-feed', '>=0.13.0'
    gem 'jekyll-seo-tag', '>=2.6.1'

    gem 'kramdown-parser-gfm', '>=1.1.0'

    # https://github.com/gjtorikian/jekyll-last-modified-at
    gem 'jekyll-last-modified-at', '>=1.1.0'

    # https://github.com/jekyll/jekyll-redirect-from
    gem 'jekyll-redirect-from', '>=0.16.0'

    gem 'html-proofer'
    # gem 'nokogiri', '>=1.8.2'

    gem 'webrick'
  end