Super secret link in responsive menu

So if you view the Pair Columbus app on a mobile device, and push the responsive menu button, a link without any text appears in between the links to "getting started" and "people" links. The blank link leads to the CSS stylesheet of the app.

[nickserv]

Good catch. This happens because SCSS files are used as templates, in Jekyll, so it thinks it's a page, so it adds it to the navbar. We should ensure navbar links only include files that we want users to load directly.