[BSv5] Tab panes are not working properly any more

[deining]

After update to Bootstrap version 5, tab panes show a weird behaviour: once you click on a tab the header of the tab pane moves out of sight. Tabs are successfully switched, though. You can see the incorrect behaviour at our user guide at docsy.dev. I haven't investigated yet whether this is a CSS issue or whether script changes are needed for the shortcode(s).