Lots of HTML/JS/Less changes: - more semantic and simple markup, no useless grid. - simpler colour schemes (TODO: colours are ugly, tune them). - better error handling in Backbone views. - fixed some view bugs. - changed new/modified page alert to a ribbon with tooltip.

<article>
    <header>
        <h1>Not Found</h1>
    </header>
    <section>
        <p>The page you're trying to access does not exist. You can <a href="/#/edit/{{path}}">create it</a>.</p>
    </section>
</article>