Proper links for base16

[ghost]

I see here:

https://github.com/spf13/hyde#themes

That this repo is linked:

https://github.com/chriskempson/base16

but that repo doesnt actually contain the themes used here. This one does:

https://github.com/chriskempson/base16-html-previews

Further, I see this:

hyde/static/css/hyde.css

Line 178 in b6a5534

/* Base16 (http://chriskempson.github.io/base16/#default) */

but that is not a valid link anymore:

$ curl -I chriskempson.github.io/base16
HTTP/1.1 404 Not Found