Add CSS related to cards from howto-cards to the theme
and allow for conditional (flag in _config.yml) loading of css style with howto-cards's cards
https://gitlab.lcsb.uni.lu/R3/howto-cards/-/blob/master/assets/css/landing.css
and allow for conditional (flag in _config.yml) loading of css style with howto-cards's cards
https://gitlab.lcsb.uni.lu/R3/howto-cards/-/blob/master/assets/css/landing.css