Xenith hero artwork

The active hero uses original generated 2D mountain artwork and layered
CSS/SVG eclipse artwork. These are artistic visuals, not a scientific simulation.
Mountain provenance is in /dark-matter/ASSETS.md.

The retained, inactive WebGL scene uses Three.js (MIT License;
see /licenses/three.txt) and a Schwarzschild-inspired accretion disk approximation.

Earlier 3D mountain assets retained in this source package used modified
Mapzen Terrain Tiles. Their credits remain at /licenses/terrain.txt.
The current hero does not request or render those elevation assets.