Change hrefs so that a single variable change can make it work for other domains

[renodubois]

So during some of our testing, we noticed that if you try and host the website on a "page" of a website (i.e. siggame.io/page) then all of the links on the page as well as links to stylesheets will be borked.

This can be fixed by prepending a {{ site.url }} variable to the beginning of most of our hrefs, and then setting that site.url to whatever site you're posting it on. It's a good change so that the website can be ported to other mediums easily, if need be.

This is fairly low priority.