Catch up with the swcarpentry/website -> swcarpentry/site transition,
specifically
86ba191 (Replaced contributing.html page with contrib/
directory containing separate pages for different ways to contribute,
2013-08-22).
[Git]: http://git-scm.com/
[linux]: https://www.kernel.org/
[gist]: https://gist.github.com/
-[swc]: http://software-carpentry.org/about/contributing.html#create
+[swc]: http://software-carpentry.org/contrib/create.html
[staging]: http://git-scm.com/about/staging-area
[rewrite]: https://www.kernel.org/pub/software/scm/git/docs/user-manual.html#cleaning-up-history
[internals]: http://git-scm.com/book/en/Git-Internals