update theme in Gemfile

added 1 commit

• 1d928fe9 - add jekyll cache to gitignore

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@jacek.lebioda, I updated the theme here for the howto-cards. May you have a look? I copied the Gemfile from https://git-r3lab.uni.lu/core-services/pages-jekyll-lcsb-template/blob/master/Gemfile. Thanks!

normally it's enough, but it might complain about bundler version. I will check it after the ELIXIR training

mentioned in merge request !56 (merged)

Closing in favour of https://git-r3lab.uni.lu/R3/howto-cards/merge_requests/56

closed