As Antergos.com contains the master keys, I think it’s security issue that https isn’t enforced there. With https it’s also broken, possibly loading CSS using http which browsers block.
HSTS could also help with it and as you appear to be using CloudFlare it’s just clicking a few boxes there. Redirecting from http to https with
*.antergos.com again is possible with the site rules.
With Antergos forum I am worried about thye usernames and passwords being transmitted in plain text over the internet so https should be enforced and HSTS should also be enabled.
Free SSL certificates would be available at least from: