Trying to load the wiki (https://wiki.lutris.net/index.php), gives me the “Your connection is not secure” message.
Seems like the https certificate needs to be changed or just drop https in favor of http.
Full message I get:
wiki.lutris.net uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported. The certificate is only valid for the following names: lutris.net, www.lutris.net The certificate expired on June 11, 2016, 1:59:59 AM GMT+2. The current time is August 6, 2018, 9:49 PM.