Minor fixes and improvements

* I learned new things about the `_config.yml` file, so I corrected it.
* A forward slash translate to the root of the domain, so `/contact.html` works just the same as `http://coffins.github.io/contact.html`, and it works even if you change your username again. :smile: 
* Updated references to your GitHub username and profile link to use the [`site.github` namespace](https://help.github.com/articles/repository-metadata-on-github-pages). Again, keeps it all in sync. :)
* Fixed capitalization error on Estonian. :wink: