After struggling a bit with the Let’s Encrypt certificate, the decisive tip for me came from Ossrox, I have set up a new page for Snowflake. For this I uploaded a now independent page that can be reached at snowflake.johns-casa.de. The link can also be found in the menu.
Further information can be found on the project page. snowflake.torproject.org.
The page should actually work, if not please leave a short comment in this post. If you want to use the site or even have to use it, please feel free to do so.