Demo link on page seems to send you to a parked domain.

[MatthewCWeston]

https://edge-dance.github.io/

The "demo" link here redirects to 'securiguard', which then sends you to a fake captcha, followed by a demand to install something called "guardglider" (seems to be some kind of undesirable program, from what little Google was able to tell me) on your computer. My guess is that the domain (https://edge-sandbox.com/) lapsed, and got bought up by some shady character or another as a means to trick unsuspecting people into downloading spyware.

Should be easy enough to just remove the link, if deprecating the demo was intended.