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:

https://github.com/spf13/hyde/blob/b6a5534d1bb207c4eb86eabdeb78175b87a6e42b/static/css/hyde.css#L178

but that is not a valid link anymore:

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