For those of you who don't read Norwegian, what the image says is a chrome warning telling me the connection may not be private. The certificate for the HTTPS connection belongs to *.github.com, not jmonkeyengine.org
I get this on the main page only, there is no issue on hub or the documentation.
This is not a device specific issue, or a platform or a network specific issue. I have tested it on three different devices over internet, (and on my phone) over mobile data.