The GitHub:buttons JavaScript code docs/static/js/buttons.js
from https://github.com/ntkme/github-buttons was referenced
in docs/layouts/partials/footer.html but never used.
Apparently, the actual code for the GitHub buttons on the upper-left
corner of gohugo.io documentation was written by @spf13 in
docs/static/js/scripts.js.
* Add meta author, description and generator tags
* Add Hugo version beside the logo and in the footer
* Suggest the user to run `go get -u -v` to update dependencies
* Requires Go 1.3+ rather than Go 1.1+
* Improve rendering/formatting in some places
* Add trailing slash to URLs where appropriate
* GitHub redirects all http requests to https, update accordingly
