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gh-pages: .nojekyll

I had the devil of a time trying to get a custom website to show up on github pages. It was sphinx generated documentation and I had put it on the website under a directory called manual. It was all borked. Not only did the nice stylesheet not show up, none of the images showed up either. I tried a whole bunch of things, but finally, from a hint here, it turns out that you need to add an empty file named .nojeykll in the root directory, and that allows you to add your own custom projects.
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