Changelog
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* Adding a scaled down version of the original high-res moon map.
* Adding a normal map generated at both the original and scaled resolutions.
* Making the normal mapped scene and shaders be the default
  - Renaming `index.html` to `basic.html`
  - Renaming `normal.html` to `index.html`
  - Renaming `scene.js` to `basic.js`
  - Renaming `normal.js` to `scene.js`