Doing some more snooping around the website.

The spirograph is actually an animated SVG (you can do that?) and the "Homestuck will be relaunching soon!" text is the title of the SVG image file.

The favicon is also an SVG but doesn't have any secrets.)

Basically everything else is a 404 page

The preview image for OpenGraphs (for displaying embeds on Discord, etc) links to this file: https://www.homestuck.com/homestuckog.jpg

A few lines in the CSS code attempt to load an unused font: @font-face { font-family: "carima"; src: url(carima.ttf); }. carima.ttf 404s, but based on the name it's the font used for the names of worlds, and the same font that the "Loading..." image uses.

Interesting...