Respectfully, www.quanth.io is an informational site and for that reason doesn't require a high level of security. However, if you click on "buy tokens" you'll be immediately transferred into a secure site.
It's pretty basic website structure - secure what needs to be secured. Lots of sites do the same thing. Start off in a standard "http://" site then once you've logged-in or enter an area where sensative info is shared, move into "https://". Check it out.