Bulk static file writing when rendering a sphere to other formats

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As we implemented #51 , we didn't have very many static files (that is, files that did not need to undergo any transformation) to write. At the time of this issue being filed, the only case of such a static file is the stylesheet. However, as the transformations evolve and become more sophisticated, we will almost certainly start to write additional static files out to disk. We should implement a more efficient path for this.