Revert "set base url to simple /"

This reverts commit 76a4a817.

_config.yml

@@ -19,7 +19,7 @@ description: >- # this means to ignore newlines until "baseurl:"
   This page is an index for lab cards  that are intended to provide practical guidance  in  implementing Data Management, Data Protection and IT setup.
 
 # URL settings (the most difficult part, please refer to the guide)
-baseurl: "/"  # the subpath of your site, e.g. /gitlab-repository-name
+baseurl: "/howto-cards"  # the subpath of your site, e.g. /gitlab-repository-name
 url: "https://howto.lcsb.uni.lu"  # the base hostname & protocol for your site, e.g. http://gitlab-namespace-name.pages.uni.lu/
 
 # Banner settings