Dead link to digital_twins folder on the digital_twin_definitions subpage

[eugenschindler]

On https://awortmann.github.io/research/digital_twin_definitions/ at the top, there is a link to https://awortmann.github.io/research/digital_twins (yielding a 404). When comparing with the "Continue reading" link to the same page on https://awortmann.github.io/research/, it seems that the one that works has a trailing slash. Maybe good to either change something in your web site settings or adapt the link on https://awortmann.github.io/research/digital_twin_definitions/?
Interestingly enough, if I just type either variant (with and without trailing slash) of the link https://awortmann.github.io/research/digital_twins into the address bar of the browser, it works (the one without trailing slash redirects to the one with a trailing slash).