Update Hugo to version 0.47

Hugo 0.47 is named Hugo Reloaded. It adds minification support for the final rendered output (run hugo --minify), but it is mostly a bug fix release. And most notably, it fixes a set of issues with live-reloading/partial rebuilds when running hugo server. Working with bundles should now be a more pleasant experience, to pick one example.

This release represents 35 contributions by 6 contributors to the main Hugo code base. @bep leads the Hugo development with a significant amount of contributions, but also a big shoutout to @satotake, @anthonyfok, and @coliff for their ongoing contributions.

And a big thanks to @digitalcraftsman and @onedrawingperday for their relentless work on keeping the themes site in pristine condition and to @kaushalmodi for his great work on the documentation site.

Many have also been busy writing and fixing the documentation in hugoDocs, which has received 21 contributions by 10 contributors. A special thanks to @bep, @aapeliv, @regisphilibert, and @brentybh for their work on the documentation site.

Hugo now has: