Homepage link uses HTTP instead of HTTPS

[samestep]

The homepage/icon button in the top-left corner of the website links to http://shader-slang.org/ instead of https://shader-slang.org/. For instance, in Firefox:

before click	after click

I'm guessing that this is a mistake, and that the website should either automatically redirect any page from HTTP to HTTPS, or at least not direct people from HTTPS to HTTP.