* add 2018 conference page (new subdirectory and index page)
* Redirect /conference route to 2018, and add new route for /conference/2017 for last year's conferences.
* Update mailto link in the footer
formerly presentation components such as `navigation` and `footer` have been nested, and renamed to `container` inside their respective component subdirs
1. Put formatting-specific components into the `presentation` subdir of `components`
2. Put content-specific components into the `container` subdir of `components`
3. Put views that are sub-urls of the site into a subdir of `views` (i.e. `microworlds`, and eventually `conference`)